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

Organic Chemistry - Hydrocarbons

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


13.
Which Lewis acid is most commonly used as catalyst in Friedel-Crafts alkylation?
A.
NaCl
B.
Anhydrous AlCl₃
C.
KOH
D.
CH₃COOH
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ANSWER :
B. Anhydrous AlCl₃
14.
Friedel-Crafts alkylation can be carried out using which of the following reagents (besides alkyl halides)?
A.
Alkenes + HF
B.
Alcohols + BF₃
C.
Only alkyl halides with AlCl₃
D.
Both alkenes with acid and alcohols with Lewis acid
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ANSWER :
D. Both alkenes with acid and alcohols with Lewis acid
15.
On treating benzene with excess of CH₃Cl in presence of anhydrous AlCl₃, the product formed is:
A.
Toluene only
B.
A mixture of polymethylated benzenes (xylenes, mesitylene, etc.)
C.
m-xylene only
D.
Hexamethylbenzene only
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ANSWER :
B. A mixture of polymethylated benzenes (xylenes, mesitylene, etc.)
16.
Which of the following is NOT a Friedel-Crafts alkylation reaction?
A.
C₆H₆ + CH₃COCl/AlCl₃ → C₆H₅COCH₃
B.
C₆H₆ + CH₃Cl/AlCl₃ → C₆H₅CH₃
C.
C₆H₆ + (CH₃)₂CHCl/AlCl₃ → C₆H₅CH(CH₃)₂
D.
C₆H₆ + CH₂=CH₂/HF → C₆H₅C₂H₅
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ANSWER :
A. C₆H₆ + CH₃COCl/AlCl₃ → C₆H₅COCH₃
17.
The role of AlCl₃ in Friedel-Crafts alkylation is to:
A.
Provide the alkyl group
B.
Reduce the alkyl halide
C.
Generate a carbocation electrophile
D.
Oxidize the benzene ring
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ANSWER :
C. Generate a carbocation electrophile
18.
Friedel-Crafts alkylation of benzene followed by treatment with [HSO₄]⁻ or [AlCl₄]⁻ in the final step involves:
A.
Addition of proton to the ring
B.
Reduction of the carbocation
C.
Oxidation of the ring
D.
Removal of proton from sp³ carbon to restore aromaticity
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ANSWER :
D. Removal of proton from sp³ carbon to restore aromaticity