Friedel (Craft's Alkylation and Acylation,...) NEET Questions

Organic Chemistry - Hydrocarbons

Friedel (Craft's Alkylation and Acylation,...) MCQ Questions


7.
In Friedel-Crafts alkylation, when benzene reacts with (CH₃)₃C-Cl in presence of AlCl₃, the product is:
A.
n-Butylbenzene
B.
Isobutylbenzene
C.
sec-Butylbenzene
D.
tert-Butylbenzene
😑 View Answer Rough Work Error
ANSWER :
D. tert-Butylbenzene
8.
The order of reactivity of alkyl halides in Friedel-Crafts alkylation is:
A.
R-I > R-Br > R-Cl > R-F
B.
R-F > R-Cl > R-Br > R-I
C.
R-F > R-I > R-Br > R-Cl
D.
R-Cl > R-Br > R-I > R-F
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ANSWER :
B. R-F > R-Cl > R-Br > R-I
9.
Which of the following compounds cannot be prepared by Friedel-Crafts alkylation?
A.
Toluene from benzene
B.
Ethylbenzene from benzene
C.
Nitrobenzene from benzene
D.
Cumene from benzene
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ANSWER :
C. Nitrobenzene from benzene
10.
In Friedel-Crafts alkylation, the carbocation rearrangement is observed because:
A.
Lewis acid promotes rearrangement
B.
Benzene catalyses the rearrangement
C.
More stable carbocation is preferred
D.
Hydride shift is forbidden
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ANSWER :
C. More stable carbocation is preferred
11.
Polyalkylation in Friedel-Crafts alkylation occurs because:
A.
Alkyl groups are activating (electron-donating)
B.
Alkyl groups are deactivating
C.
Benzene is highly stable
D.
AlCl₃ promotes polyalkylation only
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ANSWER :
A. Alkyl groups are activating (electron-donating)
12.
Friedel-Crafts alkylation of benzene with isobutyl chloride [(CH₃)₂CHCH₂Cl] in presence of AlCl₃ predominantly gives:
A.
Isobutylbenzene
B.
n-Butylbenzene
C.
sec-Butylbenzene
D.
tert-Butylbenzene
😑 View Answer Rough Work Error
ANSWER :
D. tert-Butylbenzene