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Chemistry MCQ Question - Aromatic Hydrocarbons
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1. Chlorination of toluene in the presence of sublight produces
Benzyl chloride
o - chlorotoluene
p - chlorotoluene
benzoic acid
2. The heat of hydrogenation of cyclohexene is
?239 kJ mol-1
?208 kJ mol-1
?119.5 kJ/mol
?119.5 kcal/mol
3. The resonance energy of benzene is
150.5 kJ/mol
250.5 kJ/mol
150.5 Cal/mol
250.5 Cal/mol
4. What catalyst is employed when benzene is prepared from acetylene at 70?C?
Cr2O3 + A?2O3 + SiO2
Raney nickel
Organo-nickel
Ni 250 - 300?C
5. Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from
acetylene
N-hexane
Benzene sulphonic acid
Sodium benzoate
6. Which one of the following methods will not give benzene?
Heating sod. Salt of Benzoic acid with soda lime
Distilling phenol with Zn dust
Chlorobenzene with NaOH at 360?C & 150atm.
Hydrolysis of benzene sulphonic acid with super heated steam.
7. Which is fused cyclic aromatic compound
diphenyl amine
diphenyl methane
naphthalene
biphenyl
8. In Friedel Craft Alkylation A?C?3 is used to generate
Strong nucleophile
Weak nucleophile
Strong electrophile
Weak electrophile
9. Acetophenone is a
Ether
Ketone
Aldehyde
Ester
10. Reacting bromine with benzene in the presence of sunlight will result in
The rupturing of benzene ring
Substitution reaction
Addition reaction
No-reaction
11. Benzene does not undergo
Substitution reaction
Addition reaction
Polymerization reactions
Oxidation reactions
12. During sulphonation of benzene H2SO4 generates the electrophile
HSO4-
SO2
SO3
H+
13. Nitronium ion is
NO3
NO
NO2-
NO2+
14. Which compound will readily undergo sulphonation?
Benzene
Nitro benzene
Toluene
Chlorobenzene
15. Benzene is heated in air with V2O5 at 450?C it undergoes
Substitution reaction
Addition reaction
Elimination reaction
Oxidation reaction
16. 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 1.09 A?
Molecular mass of benzene is 78.108
Resonance energy of benzene is 150.5 K Cal/mole
17. The preparation of benzene from acetylene can also be said as
Oxidation
Polymerization
Dehydration
Condensation
18. What is required other than anhydrous A?C?3 when toluene is prepared by Friedal craft reaction?
C6H6
C6H6 + CH3C?
C6H5C2H5
C6H5C? & CH3Cl
19. Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as
Dows process
Friedel & Craft acylation
Friedel & Craft alkylation
Clemmenson reduction
20. Which one of the following radical is called benzyl radical?
C6H5?
C6H5?C
C6H5?CH-
C6H5?CH2-
21. Which compound form benzoic acid on oxidation with acidified KMnO4 or K2Cr2O7
Toluene
Ethyl benzene
n-propyl benzene
All
22. Ozonolysis of benzene produces
Glycol
Glyoxal
Vicinal diol
Both b & c
23. Which one of the following is benzal chloride?
C6H5 CH2C?
C6H5 CHC?2
C6H5 -CH = CHC?
None of the above
24. What is the molecular formula of Benzenetriozonide?
C6H6O9
C6H5O8
C6H5O9
C6H6O6
25. The hydrolysis of Benzenetrizonide will yield three moles of
Glyoxime
Benzaldehyde
Glycol
Glyoxal
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