Pharm.D_POC_Aromatic Compounds_MCQ
1.The carbon atoms in benzene ring are
a) sp Hybridized
b) sp3 Hybridized
c) sp2 Hybridized
d) None of the above
2.The C-C Bond length in benzene is
a) Greater than the C-C bond length in ethane
b) Shorter than the C-C bond length in ethylene
c) Same as taht of C-C bond length in ethylene
d) Intermediate between C-C bond length in ethane and C-C bond length in ethylene
3.The electrophilic substitution reactions of aromatic compounds are initiated by a) Electrophiles
b) Nucleophiles
c) Free radicals
d) Uncharged molecules
4.Benzene undergoes substitution reaction more easily than addition reaction because a) It has a cyclic structure
b) It has three double bonds
c) It has six hydrogen atoms
d) There is delocalization of electrons
5.In the Friedel's-Craft's acetylation of an aromatic ring, the role of AlCl3 is to a) Form a acetyl ion
b) Function as a Lewis base
c) Chlorinate the aromatic ring
d) Withdraws electrons from the aromatic ring
6.Which of the following agents is used In order to make benzene react with bromine to give bromobenzene?
a) Ultraviolet light
b) Fe catalyst
c) Nickel catalyst
d) Al2O3 catalyst
7. Benzene reacts with H2 at 150°C at 30 atm in the presence of Ni catalyst to give
a) Cyclohexane
b) Cyclohexene c) n-Hexane d) No reaction occurs
8.Benzene was discovered by
A) Wolf-Kishner
B) Bayer
C) Faraday
D) Ke We
9.Which of the following substituents is an ortho and para director and ring deactivating?
a) -NH2 b) -Cl c) -OCH3 d) -OH
10.Compared to benzene, nitration of toluene takes place at
a) Same rate b) Faster rate
c) Slower rate
d) Cannot predict
11.Which one of the following compounds undergoes nitration most readily? a) Benzene
b) Toluene
c) Nitrobenzene
d) Benzoic acid
12.Which of the following compounds is most readily sulphonated?
a) Benzene
b) Chlorobenzene
c) Toluene
d) Nitrobenzene
13.An electrophile generated during sulphonation of aromatic compound is
A) HSO4-
B) SO3
C) SO2
D) NO2+
14. Which of the following is not associated with electrophilic aromatic substitution?
A) The formation of nitrobenzene
B) The formation of benzyne
C) The formation of bromo benzene
D) The formation of benzene sulfonic acid
15.The carbon atoms of benzene undergo which hybridisation
a) SP2
b) SP3
c) SP
d)SP4
16.When considering electrophilic aromatic substitution reactions electron donating subsituents (e.g. methoxy) are described as
a) ortho/para directing and activating
b) ortho/para directing and deactivating
c) meta directing and activating
d) meta directing and deactivating
17.When considering electrophilic aromatic substitution reactions the halogens are described as
a) ortho/para directing and activating
b) ortho/para directing and deactivating
c) meta directing and activating
d) meta directing and deactivating
18.According to Huckels rule of aromaticity what will be the value of n for benzene
a) One
b) Two
c) Three
d) Four
19.The Friedel-Crafts catalyst is
a) Anhydrous FeCl3
b) Hydrous FeCl3
c) Anhydrous AlCl3
d) Hydrous AlCl3
20.How many pairs of degenerate π molecular orbitals are found in benzene?
a) 6
b) 5
c) 4
d) 2
21.Name the intermediate formed in electrophilic aromatic substitution reactions a) Free radical
b) Carbanion
c) Carbene
d) Carbocation
22.What is the electrophile formed in nitration
a) NO3+
b) NO2+
c) NO+
d) N2O+
23.Methyl group donates electrons to the aromatic ring by what effect
a) Mesomeric effect
b) Electroemric effect
c) Hyperconjugation effect
d)Delocalisation of pi electrons effect
24.If benzene undergos Fridel crafts alkylation with 1-chloro propane what is the major product formed
a) Propyl benzene
b) Isopropyl benzene
c) Ethyl benzene
d)Toulene
1.The carbon atoms in benzene ring are
a) sp Hybridized
b) sp3 Hybridized
c) sp2 Hybridized
d) None of the above
2.The C-C Bond length in benzene is
a) Greater than the C-C bond length in ethane
b) Shorter than the C-C bond length in ethylene
c) Same as taht of C-C bond length in ethylene
d) Intermediate between C-C bond length in ethane and C-C bond length in ethylene
3.The electrophilic substitution reactions of aromatic compounds are initiated by a) Electrophiles
b) Nucleophiles
c) Free radicals
d) Uncharged molecules
4.Benzene undergoes substitution reaction more easily than addition reaction because a) It has a cyclic structure
b) It has three double bonds
c) It has six hydrogen atoms
d) There is delocalization of electrons
5.In the Friedel's-Craft's acetylation of an aromatic ring, the role of AlCl3 is to a) Form a acetyl ion
b) Function as a Lewis base
c) Chlorinate the aromatic ring
d) Withdraws electrons from the aromatic ring
6.Which of the following agents is used In order to make benzene react with bromine to give bromobenzene?
a) Ultraviolet light
b) Fe catalyst
c) Nickel catalyst
d) Al2O3 catalyst
7. Benzene reacts with H2 at 150°C at 30 atm in the presence of Ni catalyst to give
a) Cyclohexane
b) Cyclohexene c) n-Hexane d) No reaction occurs
8.Benzene was discovered by
A) Wolf-Kishner
B) Bayer
C) Faraday
D) Ke We
9.Which of the following substituents is an ortho and para director and ring deactivating?
a) -NH2 b) -Cl c) -OCH3 d) -OH
10.Compared to benzene, nitration of toluene takes place at
a) Same rate b) Faster rate
c) Slower rate
d) Cannot predict
11.Which one of the following compounds undergoes nitration most readily? a) Benzene
b) Toluene
c) Nitrobenzene
d) Benzoic acid
12.Which of the following compounds is most readily sulphonated?
a) Benzene
b) Chlorobenzene
c) Toluene
d) Nitrobenzene
13.An electrophile generated during sulphonation of aromatic compound is
A) HSO4-
B) SO3
C) SO2
D) NO2+
14. Which of the following is not associated with electrophilic aromatic substitution?
A) The formation of nitrobenzene
B) The formation of benzyne
C) The formation of bromo benzene
D) The formation of benzene sulfonic acid
15.The carbon atoms of benzene undergo which hybridisation
a) SP2
b) SP3
c) SP
d)SP4
16.When considering electrophilic aromatic substitution reactions electron donating subsituents (e.g. methoxy) are described as
a) ortho/para directing and activating
b) ortho/para directing and deactivating
c) meta directing and activating
d) meta directing and deactivating
17.When considering electrophilic aromatic substitution reactions the halogens are described as
a) ortho/para directing and activating
b) ortho/para directing and deactivating
c) meta directing and activating
d) meta directing and deactivating
18.According to Huckels rule of aromaticity what will be the value of n for benzene
a) One
b) Two
c) Three
d) Four
19.The Friedel-Crafts catalyst is
a) Anhydrous FeCl3
b) Hydrous FeCl3
c) Anhydrous AlCl3
d) Hydrous AlCl3
20.How many pairs of degenerate π molecular orbitals are found in benzene?
a) 6
b) 5
c) 4
d) 2
21.Name the intermediate formed in electrophilic aromatic substitution reactions a) Free radical
b) Carbanion
c) Carbene
d) Carbocation
22.What is the electrophile formed in nitration
a) NO3+
b) NO2+
c) NO+
d) N2O+
23.Methyl group donates electrons to the aromatic ring by what effect
a) Mesomeric effect
b) Electroemric effect
c) Hyperconjugation effect
d)Delocalisation of pi electrons effect
24.If benzene undergos Fridel crafts alkylation with 1-chloro propane what is the major product formed
a) Propyl benzene
b) Isopropyl benzene
c) Ethyl benzene
d)Toulene
