The structure of A in the given reaction is: | vedclass

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(D) The reaction involves the treatment of a ketone with a base $(NaOH)$ and an alkyl halide $(CH_3CH_2Br)$. This is an alkylation reaction of the eno

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(D) The reaction involves the treatment of a ketone with a base $(NaOH)$ and an alkyl halide $(CH_3CH_2Br)$. This is an alkylation reaction of the enolate ion formed from the ketone. $1$. The base $(NaOH)$ abstracts an $\alpha$-hydrogen from the ketone $(R-CO-CH_3)$ to form an enolate ion $(R-CO-CH_2^-)$. $2$. The enolate ion then acts as a nucleophile and attacks the alkyl halide $(CH_3CH_2Br)$ via an $S_N2$ mechanism. $3$. The alkyl group $(CH_3CH_2-)$ gets attached to the $\alpha$-carbon of the ketone. $4$. The resulting product is $R-CO-CH_2-CH_2-CH_3$. Comparing this with the given options,option $D$ represents the structure $R-CO-CH_2-CH_2-CH_3$.

The structure of $A$ in the given reaction is:

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