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ECAT Chemistry Aromatic Hydrocarbons Test Online

Mustansar KhanLast Updated: April 19, 2025

Chemistry Aromatic Hydrocarbons MCQS Online Test

ECAT Chemistry Aromatic Hydrocarbons Chapter Online Test

Total Questions:	180
Time Allowed:	60 Minutes
Total Marks:	180
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ECAT Chemistry Aromatic Hydrocarbons Test

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Page 1 of 8

Chemistry

1. 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

Benzene

Ethane

Ethene

Methane

2. Which one has zero octane number?

Decane

Iso – octane

n – Heptane

n – Hexane

3. The characteristic reactions of alkanes are

Addition reactions

Substitution reactions

Condensation reactions

Polymerization reactions

4. The functional group isomer of dimethyl –ether is

Propyl alcohol

Diethyl ether

Butyl alcohol

Ethyl alcohol

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

Cannot be predicted

Nuclophiles

Electrophiles

Non-metals

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

Four

One

Two

Three

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

Paili’s exclusion principle

Markownifov’s rule

Auf bau principle

Hund’s rule

8. The electrophile in aromatic sulphonation is

SO₁

H₂SO₄

SO₃⁺

HSO₄

9. Write the name of following compound

3 – ethyle – 3 – methyle hexene

4 – ethyle – 2 – methyle hexene

5 – methyle – 2 – hexane

2 – methyle hexene

10. 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

11. Benzene was discovered by Michael Faraday’s in

1826

1825

1827

1824

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

Phenol

Toluene

Aniline

Benzene

13. Benzene has a structure

Hexagonal

Tri-angular

Pyramidal

Planar hexagonal

14. Length of carbon – carbon bond is least in

Ethanol

Ethane

Ethanol

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

139 A°

120 A°

134 A°

1.54 A°

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

1, 1-Dimethyl-3-butene

1,1,1-Trimethyl-3-propene

3,3,3-Trimethyl-1-propene

3,3,-Dimethyl-1-butene

17. Which is true about benzene

All C – C bonds are different in benzene

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

Due to double bonds it easily give addition reaction

Di-substitution of benzene give six isomers

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

CH₃COOH

None

HCl

Both a & b

19. Benzene cannot undergo

Elimination

Addition

Substitution

Oxidation

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

Solubility

Density

Melting points

Boiling points

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

Phenanthrene

Naphthalene

Anthracene

Diphenyemethane

22. Alkynes are colourless & odourless except

Butyne

Acetylene

Propyne

Pentyne

23. Alkanes are soluble in all except

Water

Ether

Carbon tetra chloride

Benzene

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

ZnCl₂

HCl

HNO₃

AlCl₃

25. Aromatic hydrocarbons are the derivatives of

Benzene

Normal series of paraffin

Cyclohexane

Alkenes

Page 2 of 8

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

Maleic anhydride

Maleic acid

Benzoic acid

Acetylene

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

Dicarboxylic acid

Ono carboxylic acid

Salt of unsaturated mono carboxylic acid

Salt of unsaturated di-carboxylic acid

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

Para-magnetic

Saturated

Magnetic

Un-saturated

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

200°C

800°C

600°C

400°C

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

Pentagon

Tetrahedron

Hexagon

Cube

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

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

SP³-hybridization

Sp²-hybridization

Sp-hybridization

Dsp²-hybridization

33. In benzene carbon – carbon bonds are

Double covalent

3 single and 3 double

Of the order 1.5

Single covalent

34. Nitration of toluene takes place at

Both ‘o’ and ‘p’ positions

p-position

m-position

o-position

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

Free radical chlorination of benzene

Fridel – Craft alkylation

Sulphonation

Nitration

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

Benzene

Alkyne

Alkane

Alkene

37. All C – C bond lengths in benzene are

1.397 A°

1.54 A°

1.20 A°

1.09 A°

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

1,3 dichloro product is formed

Only alkyl group is substituted

1,4 dichloro product is formed

1,3,5 trichloro product is formed

39. The empirical formula of benzene is determined by

NMR spectra

IR spectra

Elemental analysis

U.V

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

180°

0°

60°

120°

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

Hydrogenation

Electrolysis

Catalysis

Hydrolysis

42. Unsaturated hydrocarbons containing a double bonds are called

Alkanes

Acetylene

Paraffin

Olefins

43. The general formula for alkenes is

44. Aromatic compounds burn with a sooty flame because

They have a cyclic structure

They have high percentage of C

They are resistant to react with O₂

They have high percentage of H₂

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

C6H6 + CH4

C6H6 + NH3

C6H6 + CH3COCl

C6H6 + CH3Cl

46. Point out the polycyclic compound among the following

Styrene

Naphthalence

Xylene

Cumence

47. Alkyl benzenes are readily oxidized by acidified

H₂SO₄

MnO₄

K₂CO₃

KMnO₄

48. Toluene is also called

Hydroxyl benzene

Methyl benzene

Ethyl benzene

None

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

No reaction

Isobutyl benzene

n-Butyl benzene

Tert-Butyl benzene

50. Octane number can be changed by

Isomerisation

All of these

Cyclisation

Alkylation

Page 3 of 8

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

SP²

Two SP² and two SP

Two SP³ and two SP

52. Formula of chloroform is

CHCl₃

CH₂Cl₂

CCl₄

CH₃Cl

53. During nitration of benzene the active nitrating agent is

NO⁺₂

NO¯₃

NO¯₂

NO₂

54. CnH₂n is the general formula of

Alkynes

Alkanes

Alkenes

None of these

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

Dehalogenation of vic – dilahalides

Dehydration of alcohol

Partial hydrogenation of alkanes

Dehyedro halogenation of alkyl halides

56. The benzene molecule contains

Three double bonds

One double bond

Decolourized element

Two double bonds

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

Physical activity

Chemical reactivity

Density

None

58. Alkanes cannot show cis-trans isomerism

0¯ bond is stronger then Λ-bond

The bond angle is 109.5°

Alkanes possess three groups attached to each carbon

0¯ bond required less energy to be rotated

59. Which class of compound is more reactive?

Alkane

Alkyne

None

Alkene

60. Aromatic hydrocarbons are the derivatives of

Normal series of parafins

Alkene

Cyclohexane

Benzene

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

o-Dichlorobenzene

p-Dichlorobenzene

Chlorobenzene

m-Dichlorobenzene

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

Pentane

1-Pentene

2-Pentyne

1-Pentyne

63. Alkanes containing carbons C₁₈ ownwards are

Waxy solids

Gases

Solids

Liquids

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

Transition energy

Resonance energy

Activation energy

Bonding energy

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

Acetophenone

Alkyl benzene

Chlorobenzene

Toluene

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

Ozonolysis

Polymerization

Bromination

Hydroxylation

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

Benzoic acid

Biphenyl

Benzaldehyde

Benzene sulfonic acid

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

Ketones

Adehydes

Carbonyylic acids

Fatty acids

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

Three

Four

Two

None

70. The alkynides are used for the _______ of alkynes

Pxperation

All of these

Purification

Seperation

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

Substitution

Saturation

Unsaturation

None of these

72. Which compound is the most reactive one?

Ethane

Ethene

Ethyne

Benzene

73. Benzene cannot under go

Elimination reactions

Oxidation reactions

Addition reactions

Substitution reactions

74. 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

2 : 1

1 : 2

1 : 1

1 : 3

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

CH₃Cl

CH₂Cl₂

CHCl₂

CH₃CH₂CH₃

Page 4 of 8

76. Aromaticity of benzene is due to

Delocalized Λ electronic cloud

None

Hexagonal structure

α-framework

77. The octane number is 100 for

Neo-octane

Isooctane

Neo-Pentane

n-hexane

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

All above

Cr₂O₃

Al₂O₃

SiO₂

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

-O-

H-O-

None

H-N-

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

Nitration, chlorination, reduction

Nitration, reduction, acylation, chlorination, hydrolysis

Chlorination, nitration, reduction

Nitration, reduction, chlorination

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

HF > HBr > HCI > HI

HCI > HBr > HI

None of these

Hl > HBr > HCI

82. Which species represents the electrophile in aromatic nitration?

NO⁺₂

NO₂

NO¯₃

NO¯₂

83. The hydrocarbon used for polymerization is

All of these

Alkenes

Alkanes

Alkynes

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

Phenol

Anthracene

Pysidence

Cyclohexanol

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

Methane

Benzene

Ethere

Ethyne

86. The nature of –Cl group is

Ortho directing

Para directing

Ortho and para directing

Meta directing

87. The unreactivity of alkanes is based upon

Both A and B

Non-polarity of the bonds

None of these

Inertness of sigma-bond

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

Organic compound chain compounds

They form long chain compounds

Organic compounds are water soluble

They exist in homologous series

89. Which is a mixture of low boiling hydrocarbon?

Natural gas

Wood

Petroleum

Graphite

90. Hydrocarbons contain

C, H, and O only

C and H only

C and S only

C, H, O and N only

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

1.09 A⁰

1.07 A⁰

1.10 A⁰

1.08 A⁰

92. The main halogenations agent is

X¯

X²

X⁺

93. Substituted phenyl groups are called

Acyl groups

Aryl groups

Phenyl groups

Alkyle groups

94. Molecular formula of benzene resembles with

Alkane

Alkene

None of these

Alkyne

95. The benzene molecule contain

Two double bonds

Three double bonds

Delocalized Λ electron charge

One double bond

96. Isomerism which is only found is alkanes?

cis – trans isomerism

Position isomerism

Functional group isomerism

Metamerism

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

Soda lime and copper

Zinc dust and soda lime

Zinc dust and sodium hydroxide

Soda lime and zinc dust

98. Raney – nickel is the alloy of Ni with

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

Clemmenen

Wolf kishner

Kolb’s method

Cannizzaro

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

None

Both a and b

Page 5 of 8

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

Sodium benzoate

Calcium benzoate

Benzene

Methane

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

Sabatier’s sendrens reaction

Wolf kishner reduction

Clemmensen

Kolbe’s method

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

HNO₃

NO₂¯

NO₃¯¹

NO₂⁺

104. An alkynes having Carbon count of 20 is

None

Liquid

Gas

Solid

105. Ether shows the phenomenon of

Cis – trass isomerism

Chain isomerism

Metamerism

Position isomerism

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

107. In alkanes hybridization state would be

SP²

Variable

SP³

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

Ethyne

Benzene

Ethane

Ethene

109. The structure of benzene is

Tetrahedral

Hexagonal

Square planer

Pyramidal

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

NaCl

BeCl₂

AlCl₃

HNO₃

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

1.297 A° and 1.09 A° respectively

1.01 A° and 1.297 A°

1.397 A° and 1.09 A° respectively

None of these

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

Diphenyl methane

M – xylene

O – and p – xylenes

1,3,2 – triethyl benzene

113. Which of the following is complex?

C₆H₁₂O₆

(C₆H₁₀O₅)n

CaSO₄. 0.5H₂O

CH₄

114. Which one is not an electrophile?

BF₃

AlCl₃

ZnCl₂

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

Both a and b

Buta – 1, 3-diene

1,3 butadiene

None

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

Clemmensen

Cannizzaro

Kolb

None

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

Hexachlorobenzene

Reaction is not possible

Monochlorbenzene

Dichlorodemzene

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

C₂H₂

CH₄

C₃H₈

CH₂ ≡ CH₂

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

Butane

Propane

Methane

Ethane

120. The components of petroleum can be separated due to

Having different M.P.

Having different B.P.

Having different physical states

Having different chemical properties

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

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

Combustion

Reduction

Oxidation

Decomposition

123. Which reaction is too vigorous to control?

Bromination

Iodination

Fluorination

Chlorination

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

H2C = CH2

CH3CH = CHCH3

CH ≡ CH

CH3 – CH = CH2

125. Which of the following contains single bonds?

Alkene

Alkane

Benzene

Alkyne

Page 6 of 8

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

CO₂.H₂O

None

H₂CO₃

127. Most common reactions of benzene and its derivatives are

Electrophilic substitution reactions

Nucleophilic substitution reactions

Electrophilic addition reactions

Nucleophilic addition reactions

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

Benzene triozonide

Succinic acid

Benzene diozonide

Benzene monoozonide

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

Acetophenone

Glyoxal

Cyclohexane

Hexabromo cyclohexane

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

Al₂O₃

AlCl₃

ZnCl₂

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

1,5 dimethyl benzene

1,2 dimethyl benzene

1,4 dimethyl benzene

1,3 dimethyl benzene

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

Resonating bonds

None of these

Both A and B

Conjugate bonds

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

Electrophilic

Hydrophobic

Nucleophobic

Nucleophilic

134. All the carbons of benzene are

Not hybridized at all

SP² hybridized

SP³ hybridized

Variably hybridized

135. The term aromatic was derives from

English

Russian

Latin

Greek word

136. Sp³ hybridization occurs when carbon is bound to

Three other atoms

One other atoms

Two other atoms

Four other atoms

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

Both bonds are broken

Sigma bond is broken

None of these

Pi bond is broken

138. A six membered ring containing one double bond called

Cyclohexadiene

None of these

Cyclohexene

Cyclohexane

139. The electrophile in aromatic sulphanation is

H₂SO₄

SO₃

HSO¯₄

SO⁺₃

140. Benzene is not prepared from

Phenol

Acetylene

Bromo benzene

Benzoic acid

141. 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

Thermal cracking

Stem cracking

Normal cracking

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

H₂SO₄

HSO¯₃

SO¯₂

SO₃

143. The next homologue of C₁₀H₂₂ will be

C₁₁H₂₄

C₁₃H₂₈

C₉H₂₀

C₁₂H₂₆

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

-OH group

-CHO group

+NH₂ group

-CH₃ group

145. The hydrocarbon which is used as an illuminating agent

Methane

Methyne

Methene

B & C

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

Isomerisation

Hybridization

Polymerization

Carbonization

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

121⁰

120⁰

122⁰

119⁰

148. Hybridization of each carbon atom in benzene ring is

sp³

sp² hybridized

dsp²

sp hybridized

149. Sulphuric acid generates nitronium ion by reacting with

Nitrogen gas

Nitrous acid

Nitric acid

Potassium nitrate

150. Which of the following is not an organic compound

Urea

Ammonium cyanate

Glucose

Methane

Page 7 of 8

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

Partially decreases

Increase

Decrease

Remain constant

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

Chlorobenzene

Benzene

Nitrobenzene

Toluene

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

NaHCO₃

HCl

H₂O

NaOH

154. Benzene mostly undergo

Substitution reaction

Addition reaction

Elimination reactions

All

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

Nitration reaction

Aldol condensation

Halogenation reaction

Friedel and Crafts reactions

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

P-product

O-product

m-product

O and P product

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

CH₄

CH₂ = CH₂

C₂H₆

CH ≡ CH

158. Ozonolysis of benzene results ultimately in

Benzene triozonide

Glyceraldehydes

Acetatdehyde

Glyoxal

159. Benzene reacts with ozone and gives

Glyoxal

Glycerin

Benzoic acid

Maleic anhydride

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

-Br

C₆H₅-

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

Expensive catalysis

Salts used are very expensive

Slow reaction

Number of side products produced

162. All are or-tho & Para directing except

NR₃

NH₂

163. 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 has a low b.p

It does not conduct electricity

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

(4 π + 2) o electrons

4 π electrons

(4n – 2) π electrons

(4 + 2) π electrons

165. Who discovered benzene?

Schwan

Berzellius

Kekule

Faraday

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

CO + H₂O

Maleic acid

C₂O + H₂O

Maleic anhydride

167. Incomplete oxidation of alkanes yields

CO + heat

CO & carbon black

CO and carbon black

CO₂ + heat

168. The addition of HBr is easiest with

CH3 – CH = CH2

CH2 = CHCl

ClCH = CHCl

(CH3)2 C = CH2

169. The nature of – COOH group is

Ortho and meta directing

Meta directing

Ortho directing

Para directing

170. Benzene is obtained by fractional distillation of

Middle oil

Heavy oil

Anthracene oil

Light oil

171. Benzene has a ________ structure

Tetragonal

Heptagonal

Hexagonal

Pentagonal

172. Which compound is the most reactive one?

Benzene

Ethyne

Ethane

Ethene

173. Which one does not decolourized KMnO₄?

All above

Benzene

Alkynes

Alkenes

174. The order of reactivity of halogen acids towards alkenes

HCl > HBr

HBr > HCl > HI

Hl > HBr > HCl

HCl > HBr > Hl

175. In alkynes the bonds between carbon atoms are

All pi(π) bonds

One is π(pi) and two are sigma bonds

All sigma bonds

One is sigma and two are π(pi) bonds

Page 8 of 8

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

Keto group

Alkyl group

Phenyl group

Halogens

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

Hydrolysis

Electrolysis

Hydrogenation

Hydrogenolysis

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

-C₆H₅

-Cl

-OH

-Br

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

Butane

Propane

Ethane

Methane

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

Carbinol

Ethanol

Glycol

Methanol

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Mustansar KhanLast Updated: April 19, 2025

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