ECAT Chemistry Aromatic Hydrocarbons Chapter Test Online

Page 1 of 8

Chemistry

1. Cracking is a process by which higher hydrocarbon are broken down into low boiling hydrocarbon. Which one is not generally a procedure for cracking:

Catalytic cracking

Normal cracking

Thermal cracking

Stem cracking

2. All C – H bond lengths of benzene ring is

1.07 A⁰

1.09 A⁰

1.10 A⁰

1.08 A⁰

3. Write the name of following compound

5 – methyle – 2 – hexane

3 – ethyle – 3 – methyle hexene

2 – methyle hexene

4 – ethyle – 2 – methyle hexene

4. All the carbons of benzene are

Variably hybridized

SP³ hybridized

Not hybridized at all

SP² hybridized

5. When a compound X is passed through a dilute alkaline solution of KMnO₄ the pink colour of solution is discharged. The compound X is possibly

Ethane

Methane

Ethene

Benzene

6. Which of the following is not an organic compound

Glucose

Ammonium cyanate

Methane

Urea

7. Which one of the following is not monocyclic aromatic hydrocarbon?

Benzene sulfonic acid

Benzaldehyde

Biphenyl

Benzoic acid

8. The reaction in which ketone is reduced to the alkane is called

Cannizzaro

Kolb

None

Clemmensen

9. What would be the major product of bromination of nitrobenzene?

O and P product

O-product

P-product

m-product

10. The process in which one s and two p orbitals mix up with each other is called

Sp²-hybridization

Sp-hybridization

Dsp²-hybridization

SP³-hybridization

11. The hydrocarbon which is used as an illuminating agent

Methene

B & C

Methane

Methyne

12. Point out the polycyclic compound among the following

Naphthalence

Cumence

Xylene

Styrene

13. The nitration of benzene takes place when it is heated with a mixture of conc. HNO₃ and conc. H₂SO₄ at 50°C in ratio of

1 : 3

2 : 1

1 : 2

1 : 1

14. The difference between amount of heat actually released and that of calculated is called

Activation energy

Bonding energy

Transition energy

Resonance energy

15. The electrophile in aromatic sulphanation is

SO₃

HSO¯₄

SO⁺₃

H₂SO₄

16. Benzene mostly undergo

Elimination reactions

All

Addition reaction

Substitution reaction

17. The treatment of benzene with isobutene in the presence of sulphuric acid give

No reaction

Tert-Butyl benzene

Isobutyl benzene

n-Butyl benzene

18. Which of the following is not formed by the reaction of Cl₂ on CH₄ in sunlight?

CH₂Cl₂

CHCl₂

CH₃CH₂CH₃

CH₃Cl

19. Which reaction is too vigorous to control?

Bromination

Iodination

Fluorination

Chlorination

20. An alkynes having Carbon count of 20 is

Solid

Liquid

None

Gas

21. Which of the following species participate in sulphonation of benzene ring?

SO¯₂

HSO¯₃

SO₃

H₂SO₄

22. How many isomeric di-substituted products are obtained by the introduction of second group in the ring?

Three

Two

Four

None

23. Which one of the following is (m – xylene)?

1,5 dimethyl benzene

1,4 dimethyl benzene

1,2 dimethyl benzene

1,3 dimethyl benzene

24. Which one is the catalyst in Friedle Craft’s alkylation?

Al₂O₃

ZnCl₂

Zn

AlCl₃

25. The octane number is 100 for

Neo-Pentane

n-hexane

Neo-octane

Isooctane

Page 2 of 8

26. Ozonolysis of benzene results ultimately in

Acetatdehyde

Glyoxal

Glyceraldehydes

Benzene triozonide

27. Who discovered benzene?

Berzellius

Faraday

Schwan

Kekule

28. Benzene reacts with ozone and gives

Maleic anhydride

Glycerin

Glyoxal

Benzoic acid

29. Nitration of toluene takes place at

Both ‘o’ and ‘p’ positions

m-position

o-position

p-position

30. The hydrocarbon used for polymerization is

Alkanes

All of these

Alkynes

Alkenes

31. The IUPAC name of the compound having the formula (CH3) 3 C – CH – CH2 is

3,3,3-Trimethyl-1-propene

3,3,-Dimethyl-1-butene

1, 1-Dimethyl-3-butene

1,1,1-Trimethyl-3-propene

32. Which compound is the most reactive one?

Benzene

Ethene

Ethane

Ethyne

33. The next homologue of C₁₀H₂₂ will be

C₁₂H₂₆

C₁₁H₂₄

C₁₃H₂₈

C₉H₂₀

34. Which class of compound is more reactive?

Alkyne

Alkene

None

Alkane

35. A six membered ring containing one double bond called

Cyclohexadiene

None of these

Cyclohexane

Cyclohexene

36. The rotation of two carbon atoms joined by double bond would happened only if

Both bonds are broken

Pi bond is broken

None of these

Sigma bond is broken

37. Sp³ hybridization occurs when carbon is bound to

Two other atoms

Three other atoms

Four other atoms

One other atoms

38. An alkane is produced when an alkyle halide reacts with zinc in the presence of

HCl

Both a & b

CH₃COOH

None

39. Which method is not used for the preparation of alkanes?

Dehyedro halogenation of alkyl halides

Dehalogenation of vic – dilahalides

Partial hydrogenation of alkanes

Dehydration of alcohol

40. When benzene react with acetyl chloride, what would be the product?

Toluene

Chlorobenzene

Alkyl benzene

Acetophenone

41. Alkynes can be prepared by electrolysis in Kolb’s electrolytic method of

Ono carboxylic acid

Dicarboxylic acid

Salt of unsaturated mono carboxylic acid

Salt of unsaturated di-carboxylic acid

42. Kolb’s method of alkanes production, is actually

Catalysis

Hydrogenation

Hydrolysis

Electrolysis

43. An organic compound, on treatment with Br2 in CCl4 gives bromoderivative of an alkene. The compound will be

CH ≡ CH

CH3 – CH = CH2

H2C = CH2

CH3CH = CHCH3

44. Write the name of following alkene CH₂ = CH – CH = CH₂

None

Buta – 1, 3-diene

Both a and b

1,3 butadiene

45. Toluene is also called

Hydroxyl benzene

Ethyl benzene

None

Methyl benzene

46. Polymerization if ethane take place at pressure of 100 atm and a temperature of

200°C

400°C

800°C

600°C

47. The nature of –Cl group is

Para directing

Ortho directing

Meta directing

Ortho and para directing

48. Toulene is a compound in which benzene has a substituent

-CH₃ group

-OH group

+NH₂ group

-CHO group

49. Λ – electronic cloud of alkenes can easily be attacked by

Electrophiles

Cannot be predicted

Nuclophiles

Non-metals

50. Alkanes cannot show cis-trans isomerism

0¯ bond required less energy to be rotated

The bond angle is 109.5°

Alkanes possess three groups attached to each carbon

0¯ bond is stronger then Λ-bond

Page 3 of 8

51. Substituted phenyl groups are called

Alkyle groups

Acyl groups

Phenyl groups

Aryl groups

52. The functional group isomer of dimethyl –ether is

Diethyl ether

Ethyl alcohol

Propyl alcohol

Butyl alcohol

53. Aromatic hydrocarbons are the derivatives of

Normal series of paraffin

Benzene

Cyclohexane

Alkenes

54. The process in which orbitals of different energies and shapes mix up with each other to give equivalent orbitals is called,

Carbonization

Polymerization

Hybridization

Isomerisation

55. Aromatic hydrocarbons are the derivatives of

Alkene

Benzene

Normal series of parafins

Cyclohexane

56. Which of the following compounds has longest C – H bond?

Ethene

Ethane

Benzene

Ethyne

57. Heating a mixture of sodium benzoate and soda lime gives

Benzene

Calcium benzoate

Methane

Sodium benzoate

58. Which of the following contains single bonds?

Alkane

Alkyne

Benzene

Alkene

59. In sp² type hybridization the three equivalent sp² orbitals lie in the same plane and at angle of

0°

180°

60°

120°

60. The major reaction occurring in the engines of automobiles is

Combustion

Oxidation

Reduction

Decomposition

61. Which one can give white PPt. with silver nitrate (aminooxical)?

1-Pentene

2-Pentyne

Pentane

1-Pentyne

62. The empirical formula of benzene is determined by

Elemental analysis

U.V

IR spectra

NMR spectra

63. With AlCl₃ as catalyst, benzene reacts with alkyl and acyl chlorides giving alkylated and acyclated benzene respectively. This reaction is known as

Nitration reaction

Halogenation reaction

Aldol condensation

Friedel and Crafts reactions

64. Unsaturated hydrocarbons containing a double bonds are called

Olefins

Paraffin

Acetylene

Alkanes

65. Kolb’s method has limited synthetic applications due to

Number of side products produced

Salts used are very expensive

Expensive catalysis

Slow reaction

66. Benzene is obtained from benzene sulphonic acid by treating with

H₂O

NaOH

NaHCO₃

HCl

67. A molecular orbital is formed by the linear combination of two atomic orbitals. A molecular orbital must accommodate __________ electrons

2

5

4

3

68. Benzene + Ozone → Y, in this sequence Y is

Benzene monoozonide

Benzene triozonide

Benzene diozonide

Succinic acid

69. When benzene reacts with air in the presence of V₂O₅ as a catalyst the product is

CO + H₂O

Maleic anhydride

C₂O + H₂O

Maleic acid

70. The four bonds of carbon in methane are directed towards the corners of

Cube

Tetrahedron

Pentagon

Hexagon

71. Benzene has a structure

Hexagonal

Planar hexagonal

Tri-angular

Pyramidal

72. The C-C bond angles in benzene ring are

120⁰

122⁰

121⁰

119⁰

73. The alkynides are used for the _______ of alkynes

Seperation

Purification

All of these

Pxperation

74. Octane number can be changed by

Alkylation

Isomerisation

Cyclisation

All of these

75. CnH₂n is the general formula of

Alkanes

Alkynes

None of these

Alkenes

Page 4 of 8

76. In benzene carbon – carbon bonds are

3 single and 3 double

Double covalent

Single covalent

Of the order 1.5

77. In a resonance structure of a molecule

Arrangement of atoms should be same

Pairing schame of e¯ should be same

Same energy

All are true

78. How many molecules of chlorine adds in benzene in the presence of sunlight

Four

One

Two

Three

79. Benzene has a ________ structure

Tetragonal

Heptagonal

Pentagonal

Hexagonal

80. Alkanes containing carbons C₁₈ ownwards are

Waxy solids

Gases

Solids

Liquids

81. During nitration of benzene, the active nitrating agent is

NO₂¯

NO₂⁺

NO₃¯¹

HNO₃

82. Meta directing group decreased the …………. Of benzene ring.

Density

Physical activity

Chemical reactivity

None

83. Molecular formula of benzene resembles with

Alkene

None of these

Alkane

Alkyne

84. The general formula for alkenes is

B

D

C

A

85. Incomplete oxidation of alkanes yields

CO + heat

CO₂ + heat

CO & carbon black

CO and carbon black

86. Amongst the following the strongest O and P-directing group is

C₆H₅-

OH

Cl

-Br

87. Which is the C – C bond length in benzene among the following?

1.54 A°

120 A°

139 A°

134 A°

88. The three alternate single and double bonds in the benzene ring are called

Resonating bonds

None of these

Conjugate bonds

Both A and B

89. Kolb’s method is not useful for the production of

Butane

Methane

Ethane

Propane

90. All C – C bond lengths in benzene are

1.54 A°

1.09 A°

1.20 A°

1.397 A°

91. The order of reactivity of halogen acids towards alkenes

Hl > HBr > HCl

HBr > HCl > HI

HCl > HBr > Hl

HCl > HBr

92. The method in which alkanes prepared by alkyle halides in the presence of palladium – charcoal, is

Electrolysis

Hydrogenolysis

Hydrolysis

Hydrogenation

93. Benzene is obtained by fractional distillation of

Light oil

Middle oil

Heavy oil

Anthracene oil

94. The term aromatic was derives from

Russian

Greek word

Latin

English

95. Hybridization of each carbon atom in benzene ring is

sp hybridized

dsp²

sp³

sp² hybridized

96. Sulphuric acid generates nitronium ion by reacting with

Nitrous acid

Nitric acid

Nitrogen gas

Potassium nitrate

97. The unreactivity of alkanes is based upon

None of these

Both A and B

Non-polarity of the bonds

Inertness of sigma-bond

98. Which of the following compounds contains a triple bond?

Benzene

Alkane

Alkene

Alkyne

99. Which one of the following is a heterocyclic compound?

Pysidence

Anthracene

Phenol

Cyclohexanol

100. Amongst the following, the compound can be most readily sulphonated is

Toluene

Chlorobenzene

Nitrobenzene

Benzene

Page 5 of 8

101. A gas decolourizes KMnO₄ (soln) but does not give precipitates with ammonical solution of AgNO₃. It is

CH ≡ CH

C₂H₆

CH₂ = CH₂

CH₄

102. According to x-ray studies, all C – C and C – H bond lengths in benzene are:

1.297 A° and 1.09 A° respectively

1.397 A° and 1.09 A° respectively

None of these

1.01 A° and 1.297 A°

103. Raney – nickel is the alloy of Ni with

Pd

Pt

Al

Cu

104. An alkene forms isomers if the number of carbon atoms is at least

3

4

1

2

105. Benzene cannot under go

Oxidation reactions

Elimination reactions

Substitution reactions

Addition reactions

106. The nature of – COOH group is

Para directing

Meta directing

Ortho directing

Ortho and meta directing

107. The benzene molecule contains

Decolourized element

Three double bonds

One double bond

Two double bonds

108. Which of the following gases is used for illuminating purpose?

Ethane

Butane

Methane

Propane

109. The stability of aromatic compounds decreases with -------- in the no. of its resonance structure

Increase

Partially decreases

Remain constant

Decrease

110. Which compound is the most reactive one?

Benzene

Ethane

Ethyne

Ethene

111. Which species represents the electrophile in aromatic nitration?

NO¯₃

NO⁺₂

NO¯₂

NO₂

112. Which one is not an electrophile?

Zn

BF₃

AlCl₃

ZnCl₂

113. In alkynes the bonds between carbon atoms are

One is sigma and two are π(pi) bonds

All sigma bonds

One is π(pi) and two are sigma bonds

All pi(π) bonds

114. Alkanes are soluble in all except

Carbon tetra chloride

Water

Ether

Benzene

115. During nitration of benzene the active nitrating agent is

NO¯₂

NO⁺₂

NO¯₃

NO₂

116. Benzene undergoes catalytic (V₂O₅) oxidation at 500°C to give

Benzoic acid

Maleic anhydride

Maleic acid

Acetylene

117. Which of the following acid can be used as a catalyst in Friedel Craft’s reactions?

BeCl₂

HNO₃

AlCl₃

NaCl

118. Which one of the following can be used as catalyst in Friedal Craft’s reaction?

HCl

HNO₃

AlCl₃

ZnCl₂

119. Benzene is prepared from n-hexane in the presence of catalyst

SiO₂

Al₂O₃

All above

Cr₂O₃

120. Which one has zero octane number?

n – Hexane

Decane

n – Heptane

Iso – octane

121. Ether shows the phenomenon of

Metamerism

Cis – trass isomerism

Chain isomerism

Position isomerism

122. Choose the strongest o’,p’ directing group among the following

-OH

-C₆H₅

-Cl

-Br

123. Which of the following possesses the highest melting point?

o-Dichlorobenzene

m-Dichlorobenzene

Chlorobenzene

p-Dichlorobenzene

124. Benzene cannot undergo

Addition

Oxidation

Substitution

Elimination

125. Which one can react with metal to liberate H₂ – gas?

C₃H₈

CH₂ ≡ CH₂

C₂H₂

CH₄

Page 6 of 8

126. Which is true about benzene

Due to double bonds it easily give addition reaction

All C – C bonds are different in benzene

Due to delocalized Λ electronic cloud it does not give addition reactions easily

Di-substitution of benzene give six isomers

127. The method involved for electrolysis of Na or K salts of carboxylic acids

Clemmensen

Kolbe’s method

Sabatier’s sendrens reaction

Wolf kishner reduction

128. Formula of chloroform is

CH₂Cl₂

CCl₄

CH₃Cl

CHCl₃

129. The electron releasing effect of methyl group is significant and it makes ring a good

Hydrophobic

Nucleophobic

Electrophilic

Nucleophilic

130. Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

Chlorination, nitration, reduction

Nitration, reduction, acylation, chlorination, hydrolysis

Nitration, chlorination, reduction

Nitration, reduction, chlorination

131. The electrophile in aromatic sulphonation is

HSO₄

SO₁

SO₃⁺

H₂SO₄

132. Length of carbon – carbon bond is least in

Ethane

Ethanol

Ethane

Ethanol

133. Isomerism which is only found is alkanes?

cis – trans isomerism

Functional group isomerism

Metamerism

Position isomerism

134. Most common reactions of benzene and its derivatives are

Electrophilic substitution reactions

Nucleophilic substitution reactions

Nucleophilic addition reactions

Electrophilic addition reactions

135. The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

Paili’s exclusion principle

Auf bau principle

Hund’s rule

Markownifov’s rule

136. Furan is a five membered ring in which one position is occupied by

-O-

None

H-N-

H-O-

137. In alkanes hybridization state would be

SP

SP²

SP³

Variable

138. All are or-tho & Para directing except

NR₃

X

OH

NH₂

139. Toluene reacts with CH₃Cl in the presence of anhydrous AlCl₃ to form

M – xylene

1,3,2 – triethyl benzene

O – and p – xylenes

Diphenyl methane

140. Benzene was discovered by Michael Faraday’s in

1826

1825

1824

1827

141. What type of hybridization is present in each carbon of following compound? HC ≡ C – C ≡ CH is

Two SP³ and two SP

SP²

SP

Two SP² and two SP

142. Identify the compound which has a bond angle of 109.5°

Benzene

Methane

Ethere

Ethyne

143. Compounds of carbon and hydrogen in which the tetra valency of carbon is fully satisfied are called,

Para-magnetic

Un-saturated

Saturated

Magnetic

144. The presence of a double bond is a compound is the sign of

None of these

Saturation

Substitution

Unsaturation

145. The total number of σ-bonds in benzene are

6

12

9

15

146. Identify the compounds formed when ethane combines with water in the presence of 10% sulphuric acid and HgSO₄ as catalyst

Ethanol

Methanol

Carbinol

Glycol

147. The method used only for the production of symmetrical alkanes

Cannizzaro

Clemmenen

Kolb’s method

Wolf kishner

148. The structure of benzene is

Tetrahedral

Square planer

Pyramidal

Hexagonal

149. What would be the product when Cl₂ is passed through benzene in sunlight?

Dichlorodemzene

Reaction is not possible

Monochlorbenzene

Hexachlorobenzene

150. The order of reactivity of halogen acids with alkenes is

None of these

HCI > HBr > HI

HF > HBr > HCI > HI

Hl > HBr > HCI

Page 7 of 8

151. Which is a mixture of low boiling hydrocarbon?

Graphite

Petroleum

Wood

Natural gas

152. Benzene can be obtained by heating either benzoic acid with X or phenol with Y.X and Y are respectively

Soda lime and zinc dust

Soda lime and copper

Zinc dust and soda lime

Zinc dust and sodium hydroxide

153. Which of the following is complex?

C₆H₁₂O₆

CH₄

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

154. Hydrocarbons contain

C, H, and O only

C, H, O and N only

C and S only

C and H only

155. When alkyl is treated with chlorine in the presence of sunlight?

1,4 dichloro product is formed

1,3 dichloro product is formed

Only alkyl group is substituted

1,3,5 trichloro product is formed

156. Aromaticity of benzene is due to

None

Delocalized Λ electronic cloud

Hexagonal structure

α-framework

157. When benzene is burnt in free supply of air, it is completely oxidized to

CO₂.H₂O

H₂CO₃

None

CO

158. The compound prepared by a substitution reaction of benzene is

Acetophenone

Cyclohexane

Hexabromo cyclohexane

Glyoxal

159. In Friedal-Craft’s alkylation besides AlCl3 the other reactants are

C6H6 + CH3COCl

C6H6 + CH3Cl

C6H6 + CH4

C6H6 + NH3

160. The addition of HBr is easiest with

CH2 = CHCl

ClCH = CHCl

CH3 – CH = CH2

(CH3)2 C = CH2

161. When will cyclic compounds show aromaticity according to Huckel rule? The correct statement is when it has

(4n – 2) π electrons

4 π electrons

(4 + 2) π electrons

(4 π + 2) o electrons

162. The main halogenations agent is

X²

X¯

X⁺

X

163. During the preparation of alkynes the active metals that react with tetra halo-alkanes are

Both a and b

None

Zn

Mg

164. Which compound was recognized the parent member of aromatic compounds?

Toluene

Benzene

Phenol

Aniline

165. The characteristic reactions of alkanes are

Polymerization reactions

Substitution reactions

Condensation reactions

Addition reactions

166. The benzene molecule contain

One double bond

Delocalized Λ electron charge

Three double bonds

Two double bonds

167. Which one does not decolourized KMnO₄?

Alkenes

Benzene

Alkynes

All above

168. Which of the following is not an electrophilic substitution reaction of benzene?

Nitration

Sulphonation

Free radical chlorination of benzene

Fridel – Craft alkylation

169. Benzene is not prepared from

Bromo benzene

Acetylene

Benzoic acid

Phenol

170. Aromatic compounds burn with a sooty flame because

They are resistant to react with O₂

They have a cyclic structure

They have high percentage of C

They have high percentage of H₂

171. Physical properties of alkanes increases with increase of all physical constants except

Melting points

Solubility

Density

Boiling points

172. Which one of the following belongs to meta directing group?

Halogens

Phenyl group

Keto group

Alkyl group

173. How can we locate the position of double bond is an alkene?

Hydroxylation

Ozonolysis

Bromination

Polymerization

174. Which is not the characteristic property of organic compounds?

They form long chain compounds

They exist in homologous series

Organic compound chain compounds

Organic compounds are water soluble

175. Alkyl benzenes are readily oxidized by acidified

K₂CO₃

MnO₄

H₂SO₄

KMnO₄

Page 8 of 8

176. In which one of the following compound rings are not fused together at ortho positions

Phenanthrene

Anthracene

Diphenyemethane

Naphthalene

177. Alkynes are colourless & odourless except

Acetylene

Pentyne

Butyne

Propyne

178. Catalytic oxidation of alkanes is used for the preparation of

Fatty acids

Carbonyylic acids

Adehydes

Ketones

179. Which property of benzene may be directly attributed to the stability associated with it delocalized structure?

It tends to undergo substitution rather than addition reaction

It enthalpy change of formation is positive

It does not conduct electricity

It has a low b.p

180. The components of petroleum can be separated due to

Having different physical states

Having different chemical properties

Having different M.P.

Having different B.P.

Total Questions:	180
Time Allowed:	60 Minutes
Total Marks:	180
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	ECAT Entry Test Chemistry Online Test Interview Questions about Chemisttry All Universities Entrance Test Recruitments Tests

ECAT Chemistry Aromatic Hydrocarbons Test Online

Chemistry Aromatic Hydrocarbons MCQS Online Test

ECAT Chemistry Aromatic Hydrocarbons Chapter Online Test

ECAT Chemistry Aromatic Hydrocarbons Test

Chemistry

You Might Also Like

Mustansar Khan

Leave a Reply Cancel reply

Chemistry Aromatic Hydrocarbons MCQS Online Test

ECAT Chemistry Aromatic Hydrocarbons Chapter Online Test

ECAT Chemistry Aromatic Hydrocarbons Test

Chemistry

You Might Also Like

Mustansar Khan

Your Related

ECAT Chemistry S-Block Elements Test Online

ECAT Physics Of Solids Online Test

ECAT Computer Science Security Copyright and the Law Test Online

ECAT English Antonyms 6 Online Test

ECAT Physics Heat and Thermodynamics Online Test

ECAT Chemistry Forms of Matter Test Online

Leave a Reply Cancel reply