Explanation:
In Friedel-Crafts acylation, an electrophilic acylium ion replaces a hydrogen atom on the benzene ring.
8. Which reagent pair is suitable for the acylation of benzene to form acetophenone?
A.
Acetyl chloride and anhydrous aluminium chloride
B.
Methyl chloride and sodium metal
C.
Ethanol and concentrated hydrochloric acid
D.
Acetic acid and sodium hydroxide
Correct Answer:
Acetyl chloride and anhydrous aluminium chloride
Explanation:
Acetyl chloride supplies the acetyl group, while anhydrous aluminium chloride generates the active acylium electrophile.
9. What group is introduced into the benzene ring during Friedel-Crafts acylation?
A.
Acyl group
B.
Hydroxyl group
C.
Amino group
D.
Nitro group
Correct Answer:
Acyl group
Explanation:
Benzene acylation specifically introduces an acyl group, represented as RCO−, onto the aromatic ring.
10. What is the role of anhydrous aluminium chloride in benzene acylation?
A.
It acts as a Lewis acid catalyst
B.
It acts as a reducing agent
C.
It provides the benzene ring
D.
It oxidizes the ketone product
Correct Answer:
It acts as a Lewis acid catalyst
Explanation:
Anhydrous aluminium chloride coordinates with the acyl chloride and promotes formation of the acylium ion for electrophilic attack on benzene.
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Benzene Acylation
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