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(C) The reaction sequence is as follows:$1$. Benzene reacts with $CH_3COCl$ in the presence of anhydrous $AlCl_3$ (Friedel-Crafts acylation) to form a

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Wolff-Kishner reduction

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(C) The reaction sequence is as follows:$1$. Benzene reacts with $CH_3COCl$ in the presence of anhydrous $AlCl_3$ (Friedel-Crafts acylation) to form acetophenone ($X$ = $C_6H_5COCH_3$).$2$. The conversion of $X$ $(C_6H_5COCH_3)$ to $Y$ ($C_6H_5CH_2CH_3$,ethylbenzene) is carried out using hydrazine $(N_2H_4)$ followed by heating with $KOH$ in glycol.$3$. This specific reagent system $(N_2H_4, KOH/glycol, \Delta)$ is characteristic of the Wolff-Kishner reduction,which reduces carbonyl groups $(C=O)$ to methylene groups $(CH_2)$.

In the given reaction sequence,the conversion of $X$ to $Y$ is an example of:

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