Chapter#9 Aromatic Hydrocarbons(F.sc Part 2) Chemistry Mcqs

Chapter#9
Aromatic Hydrocarbons

The molecular formula of toluene is_______

a) C7H7 b) C7H8
c) C8H8 d) C8H7

In benzene sulphonic acid,the sulphonic
group is attached with benzene ring
through_____

a) Hydrogen b) Oxygen
c) Sulpher d) –OH

Phenanthrene ________ benzene rings

a) Two b) Three
c) Four d) Five

Aniline is a derivative of benzene which
contains______

a) Hydroxyl group b) Amino group
c) Amido group d) Imido group



When benzene is substituted by halogens
only, which one of the following halogens is
given the number one position in the ring while
writing the name of compound?

a) Bromine b) Chlorine
c) Flourine d) Iodine

Which one of the following is not a meta
directing group?

a) –CN b) –OH
c) –COOH d) –CHO

Which pair of groups contains both ortho & 

para directors?

–OH, –RCO

–NR3, –CN

–OCH3, –CHO

–N (CH3)2, –NH2

Michael Faraday discovered benzene in the 

gas which was produced by destructive 

distillation of vegetable oil done in_________

The presence of Oxygen

The presence of Hydrogen

The absence of Oxygen

The presence of excessive Oxygen

How many moles of H2 are added up when 

benzene is heated with hydrogen in the 

presence of platinum?

a) Two b) Three

c) Four d) Six

In benzene the C-C bond length is larger than 

the C-H bond length by a numerical value 

of____________

a) 0.307Ao b) 0.307 nm

c) 0.337Ao d) 0.307 nm

The heat of hydrogenation of cyclohexene is 

_____________

-219.5 KJ/ mole 

219.5 calories/ mole

-119 KJ/ mole

-119 Cal/ mole

The resonance energy of benzene is______

150.5 KJ/ mole

250.5 KJ/ mole

150.5 KJ/ mole

250.5 KJ/ mole

Benzene does not undergo ___________

Substitution reaction

Addition reaction

Polymerization reactions

Oxidation reactions

During sulphonation of benzene, H2SO4 

generates____________ electrophile

a) HSO4- b) SO2

c) NO2- d) NO2+

Nitronium ion is_____________

a) NO3 b) NO

c) NO2- d) NO2+

The hydrolysis of Benzenetriozonide will yield 

three moles of ________

a) Glyoxine b) Benzaldehyde

c) Glycol d) Glyoxal

40. Which of the following will undergo nitration more easily and readily?

a) C6H6 b) C6H5CHCl2

c) C6H5CCl3 d) C6H5CH3

41. The reaction of toluene with chlorine in the presence of FeCl3 gives

Benzyl chloride

Benzal chloride

m – Chloro Toluene

O/P Chloro Toluene

42. Benzene is made of 

6 Pi and 6 sigma bonds

3 Pi and 3 sigma bonds

3 Pi and 12 sigma bonds

6 Pi and 3 sigma bonds

43. Common reaction of Benzene and its derivatives are 

Electrophilic addition 

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

44. Benzene when treated with acetyl chloride in the presence of AlCl3 yields

a) Acetyl Benzene b) Benzyl Chloride

c) Benzophenone d) Acetophenone

45. Passing vapors of Phenol over heated Zinc gives

a) Benzene b) Acetic Acid

c) Benzoic Acid d) Benzaldehyde

46. Which of the following is not an explosive?

a) Picric Acid b) Trinitrobenzene

c) Trinitro Toluene d) Nitro benzene

47. Toluene on reaction with acidic KMnO4 produces

a) Phenol b) Benzoic acid

c) Benzyl alcohol d) Benzophenone

48. The b.p of P – nitro phenol is higher than that of O – nitro phenol because

Nitro group is O/P group

Nitro group is electron donating group

Bonding occurs in P – nitro phenol

None of these

49. Which of the following can be easily nitrated?

a) Phenol b) Benzoic acid

c) Nitro benzene d) All of these

50. Aspirin is obtained by reaction of sulphuric acid and 

a) Phenol b) Benzene

c) Acetyl chloride d) None of these

51. Sulphonation of benzoic acid gives

O – benzene sulphonic acid

P – benzene sulphonic acid

m – benzene sulphonic acid

O/P benzene sulphonic acid

52. Benzene can be obtained by 

Reaction of zinc and phenol

Hydrolysis of benzene sulphonic acid

Reduction of benzene chloride

All of these

53. o – xylene on oxidation yields

a) Oxalic acid b) o – Phthalic acid

c) Toluene d) m – Phthalic acid

54. The resonance energy of benzene is 

a) 36 j/mol b) 36 cal/mol

c) 36 Kcal/mol d) none of these

55. The catalyst used for halogenation of benzene is 

a) Cu b) Ni

c) FeCl3 d) Zn

56. Which one is nitronium ion?

a) EMBED Equation.3   b) EMBED Equation.3  

c) EMBED Equation.3   d) None of these

57. Which substituent group decrease the reactivity of benzene, because they

Increase the electronic density of benzene ring

Decrease the electronic density of benzene ring

Decrease the stability of phenonium ion

Both b & c

58. Benzene on ozonolysis produces

a) Benzoic acid b) Cyclohexane

c) Glyoxal (CHO2)2 d) None of these

59. Meta orienting groups decrease the reactivity of benzene because they

Increase the electronic density of benzene

Decrease the electronic density of benzene

Decrease the stability of phenonium ion

Both b & c

60. Benzene was found by _______ in 1825 in the 

gas produced by the destructive distillation of 

vegetable oils. 

a) Hofmann b) Michael Faraday

c) Solvay d) None of these

61. Replacement of hydrogen atom by – SO2OH is 

called _______

a) Nitration b) Sulphonation 

c) Alkylation d) Hydrogenation 

62. The Kekule structures of benzene are related 

in which of the following way?

a) They are eac equally correct as structure for 

   benzene. 

b) Benzene is sometimes one structures and 

   sometime the other. 

c) The two structures are in a state of rapid 

   equilibrium. 

d) Neither of the two structures describes 

   benzene adequately 

63. The conversion of toluene into benzoic acid 

can be achieved by 

a) Br2, heat and light

b) Cl2, FeCl3

c) KMnO4, OH-, heat (then H3O+)

d) None of the above

64. The conversion of ethyl benzene into 1 – 

chloro – 1 – phenyl ethane can be achieved by 

a) Cl2, light b) Cl2, FeCl3

c) SOCl2 d) None

65. Benzene reacts with chlorine to give a 

substance with formula C6H6Cl6. This reaction 

is brought about by 

a) An acid catalyst b) Ultraviolet radiation 

c) Aluminum oxide d) Iron fillin