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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
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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ECAT Chemistry Aromatic Hydrocarbons Test

Page 1 of 8

Chemistry

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

NO₂⁺

NO₂¯

NO₃¯¹

HNO₃

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

H2C = CH2

CH3 – CH = CH2

CH3CH = CHCH3

CH ≡ CH

3. Which one does not decolourized KMnO₄?

Alkynes

All above

Benzene

Alkenes

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

CH₂ ≡ CH₂

C₂H₂

CH₄

C₃H₈

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

Reduction

Decomposition

Combustion

Oxidation

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

1.08 A⁰

1.09 A⁰

1.10 A⁰

1.07 A⁰

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

Hund’s rule

Markownifov’s rule

Auf bau principle

Paili’s exclusion principle

8. 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

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

It has a low b.p

It tends to undergo substitution rather than addition reaction

It does not conduct electricity

It enthalpy change of formation is positive

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

Salt of unsaturated di-carboxylic acid

Dicarboxylic acid

Ono carboxylic acid

Salt of unsaturated mono carboxylic acid

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

Benzene

Ethane

Ethyne

Ethene

12. The main halogenations agent is

X¯

X²

X⁺

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

Ketones

Adehydes

Carbonyylic acids

Fatty acids

14. Unsaturated hydrocarbons containing a double bonds are called

Paraffin

Olefins

Alkanes

Acetylene

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

-O-

None

H-O-

H-N-

16. Raney – nickel is the alloy of Ni with

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

Number of side products produced

Slow reaction

Expensive catalysis

Salts used are very expensive

18. Which reaction is too vigorous to control?

Iodination

Fluorination

Bromination

Chlorination

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

Two SP³ and two SP

SP²

Two SP² and two SP

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

Phenol

Toluene

Aniline

Benzene

21. 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

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

-Br

C₆H₅-

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

Both bonds are broken

Sigma bond is broken

Pi bond is broken

None of these

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

p-Dichlorobenzene

Chlorobenzene

m-Dichlorobenzene

o-Dichlorobenzene

25. The characteristic reactions of alkanes are

Condensation reactions

Polymerization reactions

Substitution reactions

Addition reactions

Page 2 of 8

26. All the carbons of benzene are

Variably hybridized

SP³ hybridized

Not hybridized at all

SP² hybridized

27. The addition of HBr is easiest with

CH2 = CHCl

ClCH = CHCl

(CH3)2 C = CH2

CH3 – CH = CH2

28. The hydrocarbon used for polymerization is

All of these

Alkanes

Alkenes

Alkynes

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

0°

120°

60°

180°

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

Methane

Propane

Butane

Ethane

31. Sulphuric acid generates nitronium ion by reacting with

Nitrous acid

Nitric acid

Nitrogen gas

Potassium nitrate

32. Alkanes containing carbons C₁₈ ownwards are

Waxy solids

Liquids

Solids

Gases

33. Which one has zero octane number?

Iso – octane

n – Hexane

Decane

n – Heptane

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

Cube

Hexagon

Pentagon

Tetrahedron

35. The alkynides are used for the _______ of alkynes

All of these

Purification

Pxperation

Seperation

36. Hydrocarbons contain

C, H, O and N only

C and H only

C and S only

C, H, and O only

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

139 A°

1.54 A°

120 A°

134 A°

38. Which is true about benzene

Due to double bonds it easily give addition reaction

Di-substitution of benzene give six isomers

All C – C bonds are different in benzene

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

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

+NH₂ group

-CH₃ group

-OH group

-CHO group

40. Which compound is the most reactive one?

Ethene

Benzene

Ethane

Ethyne

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

Electrophiles

Cannot be predicted

Nuclophiles

Non-metals

42. The structure of benzene is

Square planer

Tetrahedral

Pyramidal

Hexagonal

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

Succinic acid

Benzene triozonide

Benzene diozonide

Benzene monoozonide

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

Nitration, chlorination, reduction

Nitration, reduction, acylation, chlorination, hydrolysis

Nitration, reduction, chlorination

Chlorination, nitration, reduction

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

Cannizzaro

Clemmensen

None

Kolb

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

Wolf kishner reduction

Kolbe’s method

Sabatier’s sendrens reaction

Clemmensen

47. Which of the following is not an organic compound

Ammonium cyanate

Glucose

Urea

Methane

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

1,4 dichloro product is formed

1,3 dichloro product is formed

1,3,5 trichloro product is formed

Only alkyl group is substituted

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

Pentane

1-Pentene

1-Pentyne

2-Pentyne

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

CH₂ = CH₂

CH ≡ CH

C₂H₆

CH₄

Page 3 of 8

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

HCI > HBr > HI

HF > HBr > HCI > HI

None of these

Hl > HBr > HCI

52. Who discovered benzene?

Schwan

Kekule

Faraday

Berzellius

53. Benzene cannot undergo

Oxidation

Addition

Substitution

Elimination

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

None

Four

Two

Three

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

Ethyne

Methane

Ethere

Benzene

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

Cannizzaro

Wolf kishner

Clemmenen

Kolb’s method

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

58. 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

59. Which class of compound is more reactive?

None

Alkene

Alkane

Alkyne

60. Alkanes are soluble in all except

Water

Ether

Carbon tetra chloride

Benzene

61. Nitration of toluene takes place at

o-position

p-position

Both ‘o’ and ‘p’ positions

m-position

62. Most common reactions of benzene and its derivatives are

Nucleophilic addition reactions

Electrophilic addition reactions

Electrophilic substitution reactions

Nucleophilic substitution reactions

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

None of these

1.297 A° and 1.09 A° respectively

1.01 A° and 1.297 A°

1.397 A° and 1.09 A° respectively

64. Ozonolysis of benzene results ultimately in

Glyoxal

Acetatdehyde

Benzene triozonide

Glyceraldehydes

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

1,2 dimethyl benzene

1,4 dimethyl benzene

1,5 dimethyl benzene

1,3 dimethyl benzene

66. Which one is not an electrophile?

AlCl₃

BF₃

ZnCl₂

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

None

Both a and b

1,3 butadiene

Buta – 1, 3-diene

68. Which of the following is complex?

C₆H₁₂O₆

CaSO₄. 0.5H₂O

(C₆H₁₀O₅)n

CH₄

69. Which is a mixture of low boiling hydrocarbon?

Graphite

Petroleum

Wood

Natural gas

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

Methanol

Carbinol

Ethanol

Glycol

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

CO + H₂O

Maleic acid

C₂O + H₂O

Maleic anhydride

72. All C – C bond lengths in benzene are

1.09 A°

1.20 A°

1.397 A°

1.54 A°

73. The functional group isomer of dimethyl –ether is

Diethyl ether

Butyl alcohol

Propyl alcohol

Ethyl alcohol

74. Benzene is not prepared from

Acetylene

Bromo benzene

Phenol

Benzoic acid

75. Aromatic hydrocarbons are the derivatives of

Normal series of paraffin

Cyclohexane

Alkenes

Benzene

Page 4 of 8

76. Aromatic compounds burn with a sooty flame because

They have high percentage of H₂

They have a cyclic structure

They have high percentage of C

They are resistant to react with O₂

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

C6H6 + CH4

C6H6 + CH3Cl

C6H6 + CH3COCl

C6H6 + NH3

78. Point out the polycyclic compound among the following

Xylene

Cumence

Naphthalence

Styrene

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

Sulphonation

Fridel – Craft alkylation

Nitration

Free radical chlorination of benzene

80. Benzene is obtained by fractional distillation of

Anthracene oil

Heavy oil

Light oil

Middle oil

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

Cr₂O₃

Al₂O₃

SiO₂

All above

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

Zinc dust and soda lime

Soda lime and zinc dust

Soda lime and copper

Zinc dust and sodium hydroxide

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

Partial hydrogenation of alkanes

Dehalogenation of vic – dilahalides

Dehydration of alcohol

Dehyedro halogenation of alkyl halides

84. Which of the following contains single bonds?

Alkene

Alkyne

Alkane

Benzene

85. The next homologue of C₁₀H₂₂ will be

C₉H₂₀

C₁₂H₂₆

C₁₃H₂₈

C₁₁H₂₄

86. Length of carbon – carbon bond is least in

Ethanol

Ethane

87. The electrophile in aromatic sulphonation is

SO₃⁺

HSO₄

H₂SO₄

SO₁

88. Octane number can be changed by

Isomerisation

All of these

Alkylation

Cyclisation

89. In a resonance structure of a molecule

Same energy

Pairing schame of e¯ should be same

All are true

Arrangement of atoms should be same

90. Aromatic hydrocarbons are the derivatives of

Alkene

Normal series of parafins

Cyclohexane

Benzene

91. CnH₂n is the general formula of

Alkenes

Alkynes

Alkanes

None of these

92. Alkanes cannot show cis-trans isomerism

0¯ bond required less energy to be rotated

Alkanes possess three groups attached to each carbon

The bond angle is 109.5°

0¯ bond is stronger then Λ-bond

93. 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

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

Both a and b

None

95. Alkynes are colourless & odourless except

Propyne

Acetylene

Butyne

Pentyne

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

Anthracene

Pysidence

Cyclohexanol

Phenol

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

ZnCl₂

AlCl₃

HNO₃

HCl

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

Saturation

None of these

Unsaturation

Substitution

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

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

P-product

O-product

O and P product

m-product

Page 5 of 8

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

Both A and B

None of these

Conjugate bonds

Resonating bonds

102. During nitration of benzene the active nitrating agent is

NO₂

NO⁺₂

NO¯₃

NO¯₂

103. Isomerism which is only found is alkanes?

Position isomerism

Functional group isomerism

Metamerism

cis – trans isomerism

104. Incomplete oxidation of alkanes yields

CO & carbon black

CO + heat

CO and carbon black

CO₂ + heat

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

120⁰

121⁰

122⁰

119⁰

106. Molecular formula of benzene resembles with

Alkene

Alkyne

None of these

Alkane

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

Acetophenone

Alkyl benzene

Chlorobenzene

Toluene

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

SO¯₂

H₂SO₄

SO₃

HSO¯₃

109. Benzene has a ________ structure

Heptagonal

Pentagonal

Hexagonal

Tetragonal

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

Methane

Calcium benzoate

Sodium benzoate

Benzene

111. The benzene molecule contains

Three double bonds

One double bond

Decolourized element

Two double bonds

112. The order of reactivity of halogen acids towards alkenes

HCl > HBr

HCl > HBr > Hl

Hl > HBr > HCl

HBr > HCl > HI

113. Hybridization of each carbon atom in benzene ring is

sp³

sp hybridized

sp² hybridized

dsp²

114. The empirical formula of benzene is determined by

NMR spectra

IR spectra

Elemental analysis

U.V

115. In alkanes hybridization state would be

SP²

Variable

SP³

116. Ether shows the phenomenon of

Cis – trass isomerism

Chain isomerism

Metamerism

Position isomerism

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

Benzoic acid

Acetylene

Maleic anhydride

Maleic acid

118. The unreactivity of alkanes is based upon

Both A and B

Inertness of sigma-bond

None of these

Non-polarity of the bonds

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

Electrolysis

Catalysis

Hydrolysis

Hydrogenation

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

None

H₂CO₃

CO₂.H₂O

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

Hydroxylation

Bromination

Ozonolysis

Polymerization

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

HCl

Both a & b

None

CH₃COOH

123. In alkynes the bonds between carbon atoms are

One is sigma and two are π(pi) bonds

All pi(π) bonds

All sigma bonds

One is π(pi) and two are sigma bonds

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

Ethane

Propane

Methane

Butane

125. The components of petroleum can be separated due to

Having different M.P.

Having different B.P.

Having different chemical properties

Having different physical states

Page 6 of 8

126. 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

1, 1-Dimethyl-3-butene

3,3,3-Trimethyl-1-propene

127. In benzene carbon – carbon bonds are

Of the order 1.5

Double covalent

3 single and 3 double

Single covalent

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

Density

Physical activity

None

Chemical reactivity

129. Sp³ hybridization occurs when carbon is bound to

Three other atoms

One other atoms

Two other atoms

Four other atoms

130. Toluene is also called

Methyl benzene

Hydroxyl benzene

None

Ethyl benzene

131. The benzene molecule contain

Two double bonds

Delocalized Λ electron charge

One double bond

Three double bonds

132. The term aromatic was derives from

Latin

English

Russian

Greek word

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

Electrolysis

Hydrogenolysis

Hydrolysis

Hydrogenation

134. Aromaticity of benzene is due to

Delocalized Λ electronic cloud

Hexagonal structure

None

α-framework

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

Two

Three

One

Four

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

Alkene

Alkane

Alkyne

Benzene

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

HCl

NaHCO₃

H₂O

NaOH

138. The hydrocarbon which is used as an illuminating agent

Methyne

B & C

Methene

Methane

139. Write the name of following compound

5 – methyle – 2 – hexane

3 – ethyle – 3 – methyle hexene

4 – ethyle – 2 – methyle hexene

2 – methyle hexene

140. Alkyl benzenes are readily oxidized by acidified

H₂SO₄

MnO₄

K₂CO₃

KMnO₄

141. An alkynes having Carbon count of 20 is

None

Liquid

Solid

Gas

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

Para-magnetic

Un-saturated

Magnetic

Saturated

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

Diphenyl methane

O – and p – xylenes

1,3,2 – triethyl benzene

M – xylene

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

Nucleophilic

Hydrophobic

Electrophilic

Nucleophobic

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

Halogens

Alkyl group

Phenyl group

Keto group

146. Benzene cannot under go

Addition reactions

Substitution reactions

Oxidation reactions

Elimination reactions

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

Activation energy

Resonance energy

Transition energy

Bonding energy

148. Which species represents the electrophile in aromatic nitration?

NO¯₂

NO₂

NO⁺₂

NO¯₃

149. The general formula for alkenes is

150. Benzene reacts with ozone and gives

Glycerin

Benzoic acid

Glyoxal

Maleic anhydride

Page 7 of 8

151. Which compound is the most reactive one?

Ethene

Ethyne

Ethane

Benzene

152. Benzene mostly undergo

Elimination reactions

All

Substitution reaction

Addition reaction

153. 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

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

Density

Solubility

Boiling points

Melting points

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

Nitrobenzene

Chlorobenzene

Benzene

Toluene

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

Phenanthrene

Naphthalene

Anthracene

Diphenyemethane

157. Benzene was discovered by Michael Faraday’s in

1825

1827

1824

1826

158. Benzene has a structure

Hexagonal

Tri-angular

Planar hexagonal

Pyramidal

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

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

NaCl

HNO₃

AlCl₃

BeCl₂

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

Cyclohexane

Glyoxal

Hexabromo cyclohexane

Acetophenone

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

Partially decreases

Decrease

Increase

Remain constant

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

Hexachlorobenzene

Monochlorbenzene

Dichlorodemzene

Reaction is not possible

164. The octane number is 100 for

Neo-octane

Isooctane

n-hexane

Neo-Pentane

165. Formula of chloroform is

CH₂Cl₂

CH₃Cl

CCl₄

CHCl₃

166. Substituted phenyl groups are called

Phenyl groups

Acyl groups

Alkyle groups

Aryl groups

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

CH₃CH₂CH₃

CHCl₂

CH₃Cl

CH₂Cl₂

168. A six membered ring containing one double bond called

None of these

Cyclohexane

Cyclohexene

Cyclohexadiene

169. 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

1 : 2

1 : 1

2 : 1

170. The nature of –Cl group is

Para directing

Meta directing

Ortho directing

Ortho and para directing

171. The nature of – COOH group is

Meta directing

Ortho and meta directing

Para directing

Ortho directing

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

Halogenation reaction

Friedel and Crafts reactions

Aldol condensation

Nitration reaction

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

400°C

200°C

600°C

800°C

174. The electrophile in aromatic sulphanation is

SO₃

HSO¯₄

H₂SO₄

SO⁺₃

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

(4 + 2) π electrons

(4n – 2) π electrons

(4 π + 2) o electrons

4 π electrons

Page 8 of 8

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

No reaction

n-Butyl benzene

Tert-Butyl benzene

Isobutyl benzene

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

Benzene sulfonic acid

Biphenyl

Benzoic acid

Benzaldehyde

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

-OH

-Br

-Cl

-C₆H₅

179. All are or-tho & Para directing except

NH₂

NR₃

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

ZnCl₂

AlCl₃

Al₂O₃

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Mustansar KhanLast Updated: April 19, 2025

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