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

Organic Chemistry - Hydrocarbons

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


1.
In Friedel-Crafts alkylation reaction of benzene, which of the following acts as the catalyst?
A.
NaOH
B.
Concentrated H₂SO₄
C.
Dilute HCl
D.
Anhydrous AlCl₃
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ANSWER :
D. Anhydrous AlCl₃
2.
The electrophile involved in Friedel-Crafts alkylation of benzene with CH₃Cl in presence of AlCl₃ is:
A.
CH₃⁻
B.
CH₃⁺
C.
CH₃·
D.
CH₂Cl⁺
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ANSWER :
B. CH₃⁺
3.
When benzene reacts with 1-chloropropane in presence of anhydrous AlCl₃, the major product is:
A.
n-Propylbenzene
B.
Cyclopropylbenzene
C.
Allylbenzene
D.
Isopropylbenzene (cumene)
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ANSWER :
D. Isopropylbenzene (cumene)
4.
Which of the following alkyl halides will NOT undergo Friedel-Crafts alkylation effectively?
A.
CH₃Cl
B.
C₂H₅Br
C.
CH₂=CH-Cl (vinyl chloride)
D.
(CH₃)₃CCl
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ANSWER :
C. CH₂=CH-Cl (vinyl chloride)
5.
Which of the following is a major limitation of Friedel-Crafts alkylation?
A.
Polysubstitution and carbocation rearrangement occur
B.
It does not work with benzene
C.
It requires very high temperature only
D.
It produces only meta isomers
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ANSWER :
A. Polysubstitution and carbocation rearrangement occur
6.
Friedel-Crafts alkylation of nitrobenzene with CH₃Cl/AlCl₃ gives:
A.
No reaction occurs
B.
p-nitrotoluene as major product
C.
m-nitrotoluene as major product
D.
o-nitrotoluene as major product
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ANSWER :
A. No reaction occurs