Aromatic Hydrocarbons MCQs
MCQ's with answers from chapter 9 Aromatic Hydrocarbons chemistry book 2 for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.
- 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
- How many π electrons are there in benzene?
a) 3 b) 4
c) 6 d) 8
- The molecular formula of biphenyl methane
is____________
a) C12H10 b) C12H12
c) C13H10 d) C13H12
- When two or more different substituents are
attached with a benzene ring, the number 1
position in the ring is given to a high priority
group. Which one of the following groups has
highest priority?
a) –NH2 b) –CHO
c) –COOH d) –CN
- 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
- The resonance between different structures is
represented by______
- ~
- What catalyst is employed when benzene is
prepared from acetylene at 70˚C?
- Zn amalgam
- AlCl3
- Organo-nickel
- Rancy Rickel
- Mixture of catalysts Cr2O3 + Al2O3 + SiO2 at
500˚C are used when benzene is prepared
from____________
- Cycloalkene
- n-hexane
- Benzene sulphonic acid
- Sodium benzoate
- Which one of the following methods will not
give benzene?
- Heating so. Salt of Benzoic acid with soda lime
- Distillation phenol with Zn dust
- Chlorobenzene with NaOH at 360
˚C & 300atm.
- Hydrolysis of benzene sulphonic acid with super heated steam.
- What is the ratio of conc. HNO3 & conc.
H2SO4 when nitration of benzene is done at
50˚C?
a) 1:1 b) 2:1
c) 1:2 d) 2:3
- In Friedel Craft Alkylation, AlCl3 is used to
generate___________
- Strong nucleophile
- Weak nucleophile
- Strong electrophite
- Weak electrophite
- Acylation of benzene is the introduction of
___________on benzene.
O
||
- R ─ C ─ O ─
O
||
- Cl ─ C ─
O
||
- R ─ C ─
O
||
- H ─ C ─
- Acetophenone is a ______________
a) Quinone b) Ketone
c) Aldehyde d) Other
- Reacting bromine with benzene in the
presence of sunlight will result in__________
- The rupturing of Benzene mg
- Substitution reaction
- Addition reaction
- No-reaction
- 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+
- Which compound will readily undergo
sulphonation?
a) Benzene b) Nitro benzene
c) Golvene d) Chlorobenzene
- Benzene is heated in air with V2O5 at 450˚C it
undergo ___________
- Substitution reaction
- Addition reaction
- Elimination reaction
- Oxidation reaction
- Which one of the following statement is not
correct about benzene?
- On hydrogenation, 208 KJ/ mole is liberated
- C-H bond length in benzene is 1.09Ao
- Molecular mass of benzene is 78.108
- Resonance energy of benzene is 150.5 K Cal / mole
- The preparation of benzene from acethylene
can also be said as ________
a) Oxidation b) Polymerization
c) Dehydration d) Condensation
- What is required other then anhydrous AlCl3,
when toluene is prepared from Friedel craft
reaction?
a) C6H6 b) C6H6 + CH3Cl
c) C6H5C2H5 d) C6H5 ─ CH2─
- Replacement of hydrogen of benzene by alkyl
group in pressure of alkyl halide & ferric
chloride is known as____________
- Dow’s process
- Friedel & Craft acylation
- Friedel & Craft alkylation
- Clemenson reaction
- Which of the following radical is called benzyl
radical?
a) C6H5─ b) C6H5─CH=CH2
c) C6H5─CH─ d) C6H5─CH2─
- Which compound form benzoic acid on
oxidation with strong oxidizing agent?
a) Toluene b) Ethyle benzene
c) n-propyl bezene d) all
- Toluene can be converted to benzoic acid in
presence of _________
- Dil NaO4
- Mixture of HNO3 & H2SO4
- Zn dust
- Acidified KMnO4
- Which one of the following is benzal chloride?
- C6H5 CH2Cl
- C6H5 CHCl2
- C6H5─CH = CHCl
- None of the above
- What is the molecular formula of
Benzenetriozonide?
a) C6H6O9 b) C6H5O8
c) C6H5O9 d) C6H6O6
- 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
a) Benzyl chloride
b) Benzal chloride
c) m – Chloro Toluene
d) O/P Chloro Toluene
42. Benzene is made of
a) 6 Pi and 6 sigma bonds
b) 3 Pi and 3 sigma bonds
c) 3 Pi and 12 sigma bonds
d) 6 Pi and 3 sigma bonds
43. Common reaction of Benzene and its derivatives are
a) Electrophilic addition
b) Electrophilic substitution
c) Nucleophilic addition
d) 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
a) Nitro group is O/P group
b) Nitro group is electron donating group
c) Bonding occurs in P – nitro phenol
d) 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
a) O – benzene sulphonic acid
b) P – benzene sulphonic acid
c) m – benzene sulphonic acid
d) O/P benzene sulphonic acid
52. Benzene can be obtained by
a) Reaction of zinc and phenol
b) Hydrolysis of benzene sulphonic acid
c) Reduction of benzene chloride
d) 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) b)
c) d) None of these
57. Which substituent group decrease the reactivity of benzene, because they
a) Increase the electronic density of benzene ring
b) Decrease the electronic density of benzene ring
c) Decrease the stability of phenonium ion
d) 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
a) Increase the electronic density of benzene
b) Decrease the electronic density of benzene
c) Decrease the stability of phenonium ion
d) 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 fillings
66. Which of the following will be least reactive to
ring bromination using bromine water?
a) Toluene b) Nitrobenzene
c) Chlorobenzene d) Aniline
67. Benzene and cyclohexene can be
distinguished by which of the following test?
a) AgNo3 │C2H5OH b) Ag(NH3)2OH
c) Br2 │CCl4 d) None
68. Which of the following test can be used to
distinguish C6H5CH2Br and C6H5CH3?
a) Ag(NH3)2OH b) Br2 │CCl4
c) AgNO3 │C2H5OH d) Hot KMnO4
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