(A) When an aldehyde or ketone reacts with $PCl_5$,the oxygen atom of the carbonyl group is replaced by two chlorine atoms,resulting in the formation

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(A) When an aldehyde or ketone reacts with $PCl_5$,the oxygen atom of the carbonyl group is replaced by two chlorine atoms,resulting in the formation of a gem-dihalide (where both halogen atoms are attached to the same carbon atom). The reaction is: $CH_3CH_2CHO + PCl_5 \to CH_3CH_2CHCl_2 + POCl_3$. Thus,the product formed is a gem-dihalide.