ECAT Chemistry Aromatic Hydrocarbons Chapter Test Online

Page 1 of 8

Chemistry

1. Sp³ hybridization occurs when carbon is bound to

Four other atoms

One other atoms

Three other atoms

Two other atoms

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

180°

120°

0°

60°

3. All C – C bond lengths in benzene are

1.397 A°

1.54 A°

1.09 A°

1.20 A°

4. Benzene is not prepared from

Bromo benzene

Acetylene

Benzoic acid

Phenol

5. Which of the following is complex?

C₆H₁₂O₆

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

CH₄

6. The hydrocarbon which is used as an illuminating agent

Methyne

Methene

B & C

Methane

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

1.09 A⁰

1.08 A⁰

1.10 A⁰

1.07 A⁰

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

-CH₃ group

-OH group

+NH₂ group

-CHO group

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

400°C

200°C

800°C

600°C

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

1.01 A° and 1.297 A°

1.397 A° and 1.09 A° respectively

None of these

1.297 A° and 1.09 A° respectively

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

Para-magnetic

Saturated

Magnetic

Un-saturated

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

Dehydration of alcohol

Dehalogenation of vic – dilahalides

Dehyedro halogenation of alkyl halides

Partial hydrogenation of alkanes

13. Aromatic compounds burn with a sooty flame because

They have high percentage of C

They have a cyclic structure

They have high percentage of H₂

They are resistant to react with O₂

14. The structure of benzene is

Hexagonal

Tetrahedral

Pyramidal

Square planer

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

Adehydes

Fatty acids

Ketones

Carbonyylic acids

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

Conjugate bonds

Resonating bonds

None of these

Both A and B

17. The alkynides are used for the _______ of alkynes

Seperation

Purification

All of these

Pxperation

18. Which one is not an electrophile?

AlCl₃

BF₃

Zn

ZnCl₂

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

Benzaldehyde

Benzoic acid

Biphenyl

Benzene sulfonic acid

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

Acetophenone

Toluene

Alkyl benzene

Chlorobenzene

21. Which of the following contains single bonds?

Benzene

Alkyne

Alkene

Alkane

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

Nitration, reduction, chlorination

Nitration, reduction, acylation, chlorination, hydrolysis

Chlorination, nitration, reduction

Nitration, chlorination, reduction

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

Benzene monoozonide

Succinic acid

Benzene triozonide

Benzene diozonide

24. All are or-tho & Para directing except

X

NR₃

OH

NH₂

25. The hydrocarbon used for polymerization is

All of these

Alkynes

Alkenes

Alkanes

Page 2 of 8

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

Only alkyl group is substituted

1,3 dichloro product is formed

1,4 dichloro product is formed

1,3,5 trichloro product is formed

27. The nature of –Cl group is

Ortho and para directing

Para directing

Ortho directing

Meta directing

28. Hydrocarbons contain

C and S only

C, H, O and N only

C, H, and O only

C and H only

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

Dichlorodemzene

Monochlorbenzene

Reaction is not possible

Hexachlorobenzene

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

Bonding energy

Transition energy

Resonance energy

Activation energy

31. 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 : 1

1 : 2

2 : 1

1 : 3

32. Alkanes containing carbons C₁₈ ownwards are

Waxy solids

Solids

Liquids

Gases

33. Benzene is obtained by fractional distillation of

Middle oil

Heavy oil

Anthracene oil

Light oil

34. Aromatic hydrocarbons are the derivatives of

Normal series of paraffin

Cyclohexane

Benzene

Alkenes

35. Which is a mixture of low boiling hydrocarbon?

Graphite

Wood

Petroleum

Natural gas

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

-C₆H₅

-Br

-OH

-Cl

37. Raney – nickel is the alloy of Ni with

Cu

Pd

Pt

Al

38. Isomerism which is only found is alkanes?

cis – trans isomerism

Metamerism

Position isomerism

Functional group isomerism

39. Benzene was discovered by Michael Faraday’s in

1824

1825

1826

1827

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

Benzoic acid

Acetylene

Maleic acid

Maleic anhydride

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

Ethere

Methane

Ethyne

Benzene

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

None

Clemmensen

Kolb

Cannizzaro

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

AlCl₃

ZnCl₂

HCl

HNO₃

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

Methanol

Glycol

Carbinol

Ethanol

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

CO + H₂O

Maleic acid

Maleic anhydride

C₂O + H₂O

46. Alkyl benzenes are readily oxidized by acidified

K₂CO₃

KMnO₄

H₂SO₄

MnO₄

47. The term aromatic was derives from

English

Greek word

Latin

Russian

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

C6H6 + CH3Cl

C6H6 + NH3

C6H6 + CH3COCl

C6H6 + CH4

49. In alkanes hybridization state would be

SP³

Variable

SP

SP²

50. The general formula for alkenes is

B

D

A

C

Page 3 of 8

51. Alkanes are soluble in all except

Benzene

Ether

Water

Carbon tetra chloride

52. The electrophile in aromatic sulphonation is

SO₁

H₂SO₄

SO₃⁺

HSO₄

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

None of these

Pi bond is broken

Both bonds are broken

Sigma bond is broken

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

H2C = CH2

CH ≡ CH

CH3 – CH = CH2

CH3CH = CHCH3

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

HCl

CH₃COOH

None

Both a & b

56. The octane number is 100 for

n-hexane

Neo-octane

Isooctane

Neo-Pentane

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

Hydroxylation

Polymerization

Ozonolysis

Bromination

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

Melting points

Density

Solubility

Boiling points

59. 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

Zinc dust and soda lime

Soda lime and copper

Zinc dust and sodium hydroxide

60. Sulphuric acid generates nitronium ion by reacting with

Nitric acid

Potassium nitrate

Nitrogen gas

Nitrous acid

61. Alkynes are colourless & odourless except

Propyne

Acetylene

Pentyne

Butyne

62. Ether shows the phenomenon of

Chain isomerism

Metamerism

Cis – trass isomerism

Position isomerism

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

Cannot be predicted

Non-metals

Nuclophiles

Electrophiles

64. Benzene mostly undergo

Substitution reaction

All

Addition reaction

Elimination reactions

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

Nitration

Free radical chlorination of benzene

Fridel – Craft alkylation

Sulphonation

66. Benzene has a ________ structure

Hexagonal

Heptagonal

Pentagonal

Tetragonal

67. Incomplete oxidation of alkanes yields

CO₂ + heat

CO and carbon black

CO + heat

CO & carbon black

68. The order of reactivity of halogen acids towards alkenes

HCl > HBr

HBr > HCl > HI

Hl > HBr > HCl

HCl > HBr > Hl

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

Benzene

Alkene

Alkane

Alkyne

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

120⁰

121⁰

119⁰

122⁰

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

Markownifov’s rule

Paili’s exclusion principle

Auf bau principle

Hund’s rule

72. Aromatic hydrocarbons are the derivatives of

Alkene

Benzene

Normal series of parafins

Cyclohexane

73. The nature of – COOH group is

Para directing

Ortho and meta directing

Meta directing

Ortho directing

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

They form long chain compounds

Organic compounds are water soluble

They exist in homologous series

Organic compound chain compounds

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

Salts used are very expensive

Slow reaction

Expensive catalysis

Number of side products produced

Page 4 of 8

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

Isomerisation

Polymerization

Hybridization

Carbonization

77. In benzene carbon – carbon bonds are

Single covalent

Double covalent

3 single and 3 double

Of the order 1.5

78. Ozonolysis of benzene results ultimately in

Glyoxal

Benzene triozonide

Acetatdehyde

Glyceraldehydes

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

Clemmenen

Kolb’s method

Cannizzaro

Wolf kishner

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

CH₄

C₂H₆

CH₂ = CH₂

CH ≡ CH

81. Aromaticity of benzene is due to

Delocalized Λ electronic cloud

None

α-framework

Hexagonal structure

82. The addition of HBr is easiest with

CH2 = CHCl

(CH3)2 C = CH2

CH3 – CH = CH2

ClCH = CHCl

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

Sp-hybridization

Dsp²-hybridization

SP³-hybridization

Sp²-hybridization

84. A six membered ring containing one double bond called

Cyclohexene

None of these

Cyclohexane

Cyclohexadiene

85. Which reaction is too vigorous to control?

Bromination

Iodination

Fluorination

Chlorination

86. Which one does not decolourized KMnO₄?

All above

Alkenes

Alkynes

Benzene

87. Benzene reacts with ozone and gives

Glycerin

Glyoxal

Benzoic acid

Maleic anhydride

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

Hydrolysis

Electrolysis

Hydrogenation

Catalysis

89. Which compound is the most reactive one?

Ethyne

Benzene

Ethene

Ethane

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

Oxidation

Reduction

Combustion

Decomposition

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

Wolf kishner reduction

Sabatier’s sendrens reaction

Clemmensen

Kolbe’s method

92. Which is true about benzene

Di-substitution of benzene give six isomers

Due to double bonds it easily give addition reaction

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

All C – C bonds are different in benzene

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

M – xylene

Diphenyl methane

1,3,2 – triethyl benzene

O – and p – xylenes

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

O and P product

O-product

P-product

m-product

95. Length of carbon – carbon bond is least in

Ethanol

Ethane

Ethanol

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

Anthracene

Naphthalene

Diphenyemethane

Phenanthrene

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

H-O-

H-N-

-O-

None

98. 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.

99. Which one has zero octane number?

Iso – octane

Decane

n – Heptane

n – Hexane

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

Dicarboxylic acid

Salt of unsaturated di-carboxylic acid

Ono carboxylic acid

Salt of unsaturated mono carboxylic acid

Page 5 of 8

101. Most common reactions of benzene and its derivatives are

Electrophilic substitution reactions

Electrophilic addition reactions

Nucleophilic addition reactions

Nucleophilic substitution reactions

102. Formula of chloroform is

CH₂Cl₂

CCl₄

CH₃Cl

CHCl₃

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

Nitrobenzene

Chlorobenzene

Toluene

Benzene

104. The benzene molecule contains

One double bond

Two double bonds

Three double bonds

Decolourized element

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

Al₂O₃

Cr₂O₃

All above

SiO₂

106. Molecular formula of benzene resembles with

Alkene

Alkyne

Alkane

None of these

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

Hydrogenation

Hydrogenolysis

Electrolysis

Hydrolysis

108. Nitration of toluene takes place at

Both ‘o’ and ‘p’ positions

o-position

m-position

p-position

109. The main halogenations agent is

X⁺

X²

X¯

X

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

Al₂O₃

ZnCl₂

AlCl₃

Zn

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

H₂SO₄

HSO¯₃

SO₃

SO¯₂

112. Write the name of following compound

4 – ethyle – 2 – methyle hexene

2 – methyle hexene

3 – ethyle – 3 – methyle hexene

5 – methyle – 2 – hexane

113. Toluene is also called

Methyl benzene

Hydroxyl benzene

Ethyl benzene

None

114. Octane number can be changed by

All of these

Isomerisation

Cyclisation

Alkylation

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

One

Two

Three

Four

116. The benzene molecule contain

Delocalized Λ electron charge

One double bond

Two double bonds

Three double bonds

117. During nitration of benzene the active nitrating agent is

NO⁺₂

NO₂

NO¯₃

NO¯₂

118. The empirical formula of benzene is determined by

U.V

Elemental analysis

NMR spectra

IR spectra

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

Propane

Methane

Butane

Ethane

120. All the carbons of benzene are

SP² hybridized

SP³ hybridized

Variably hybridized

Not hybridized at all

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

5

2

3

4

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

Three

Four

Two

None

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

Sodium benzoate

Benzene

Calcium benzoate

Methane

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

9

12

6

15

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

Nucleophilic

Nucleophobic

Electrophilic

Hydrophobic

Page 6 of 8

126. Which of the following is not an organic compound

Ammonium cyanate

Urea

Glucose

Methane

127. Point out the polycyclic compound among the following

Cumence

Xylene

Naphthalence

Styrene

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

Thermal cracking

Normal cracking

Catalytic cracking

Stem cracking

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

Mg

None

Zn

Both a and b

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

C₆H₅-

Cl

-Br

OH

131. The next homologue of C₁₀H₂₂ will be

C₉H₂₀

C₁₃H₂₈

C₁₂H₂₆

C₁₁H₂₄

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

Cube

Pentagon

Hexagon

Tetrahedron

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

C₃H₈

CH₄

CH₂ ≡ CH₂

C₂H₂

134. Unsaturated hydrocarbons containing a double bonds are called

Acetylene

Alkanes

Olefins

Paraffin

135. Benzene cannot undergo

Elimination

Substitution

Oxidation

Addition

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

Benzene

Toluene

Phenol

Aniline

137. An alkynes having Carbon count of 20 is

Solid

Liquid

None

Gas

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

Remain constant

Decrease

Partially decreases

Increase

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

Butane

Propane

Methane

Ethane

140. Hybridization of each carbon atom in benzene ring is

dsp²

sp² hybridized

sp³

sp hybridized

141. 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 has a low b.p

It does not conduct electricity

It enthalpy change of formation is positive

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

Ethene

Benzene

Ethyne

Ethane

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

CO₂.H₂O

CO

H₂CO₃

None

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

3,3,-Dimethyl-1-butene

1,1,1-Trimethyl-3-propene

3,3,3-Trimethyl-1-propene

1, 1-Dimethyl-3-butene

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

BeCl₂

AlCl₃

HNO₃

NaCl

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

Glyoxal

Cyclohexane

Hexabromo cyclohexane

Acetophenone

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

CH₃CH₂CH₃

CHCl₂

CH₂Cl₂

CH₃Cl

148. Benzene cannot under go

Elimination reactions

Addition reactions

Oxidation reactions

Substitution reactions

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

Tert-Butyl benzene

Isobutyl benzene

n-Butyl benzene

No reaction

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

134 A°

1.54 A°

139 A°

120 A°

Page 7 of 8

151. In alkynes the bonds between carbon atoms are

All pi(π) bonds

All sigma bonds

One is π(pi) and two are sigma bonds

One is sigma and two are π(pi) bonds

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

Aldol condensation

Friedel and Crafts reactions

Halogenation reaction

Nitration reaction

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

Phenyl group

Halogens

Alkyl group

Keto group

154. 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

155. CnH₂n is the general formula of

Alkynes

None of these

Alkenes

Alkanes

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

4 π electrons

(4n – 2) π electrons

(4 + 2) π electrons

(4 π + 2) o electrons

157. In a resonance structure of a molecule

Arrangement of atoms should be same

All are true

Same energy

Pairing schame of e¯ should be same

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

p-Dichlorobenzene

o-Dichlorobenzene

m-Dichlorobenzene

Chlorobenzene

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

1-Pentene

2-Pentyne

1-Pentyne

Pentane

160. Benzene has a structure

Hexagonal

Tri-angular

Pyramidal

Planar hexagonal

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

Buta – 1, 3-diene

Both a and b

1,3 butadiene

None

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

None

Density

Chemical reactivity

Physical activity

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

HF > HBr > HCI > HI

None of these

HCI > HBr > HI

Hl > HBr > HCI

164. The electrophile in aromatic sulphanation is

H₂SO₄

SO⁺₃

HSO¯₄

SO₃

165. 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

166. Which compound is the most reactive one?

Ethene

Ethane

Ethyne

Benzene

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

NaHCO₃

NaOH

H₂O

HCl

168. Alkanes cannot show cis-trans isomerism

0¯ bond is stronger then Λ-bond

Alkanes possess three groups attached to each carbon

0¯ bond required less energy to be rotated

The bond angle is 109.5°

169. Who discovered benzene?

Schwan

Berzellius

Kekule

Faraday

170. The unreactivity of alkanes is based upon

Non-polarity of the bonds

Inertness of sigma-bond

Both A and B

None of these

171. Which class of compound is more reactive?

Alkane

None

Alkene

Alkyne

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

Cyclohexanol

Phenol

Pysidence

Anthracene

173. The characteristic reactions of alkanes are

Addition reactions

Condensation reactions

Polymerization reactions

Substitution reactions

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

3

1

2

4

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

1,2 dimethyl benzene

1,3 dimethyl benzene

1,5 dimethyl benzene

1,4 dimethyl benzene

Page 8 of 8

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

NO₂⁺

HNO₃

NO₃¯¹

NO₂¯

177. Which species represents the electrophile in aromatic nitration?

NO¯₃

NO₂

NO¯₂

NO⁺₂

178. The functional group isomer of dimethyl –ether is

Butyl alcohol

Diethyl ether

Ethyl alcohol

Propyl alcohol

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

Unsaturation

None of these

Saturation

Substitution

180. Substituted phenyl groups are called

Aryl groups

Alkyle groups

Phenyl groups

Acyl groups

Total Questions:	180
Time Allowed:	60 Minutes
Total Marks:	180
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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