The major products U and V in the following reaction are
To identify the major products U and V in the given reaction sequence, we need to analyze both steps of the reaction.
Step 1: The reaction of phenol with isobutyl bromide in the presence of K2CO3 and acetone.
The role of K2CO3 is to deprotonate the phenol, thereby forming phenoxide ion. This ion acts as a nucleophile in an SN2 reaction with isobutyl bromide, resulting in the substitution of the bromide with an isobutyl group on the phenoxide. Thus, compound U is isobutyl phenyl ether.
Step 2: The reaction of phenoxide formed with another alkyl bromide in basic conditions (KOH in benzene).
In the presence of KOH and heat in benzene, the phenoxide ion can undergo another SN2 reaction but this time with the ethylene bromide given. This substitution results in the formation of an ether linkage with ethyl group. The correct product, compound V, would therefore be ethyl isobutyl phenyl ether.
Based on the explanation above, the major products U and V are as shown in the correct image option:
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