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(C) Step $1$: Hydration of ethyne $(HC \equiv CH)$ in the presence of $1\% \, HgSO_4$ and $20\% \, H_2SO_4$ yields acetaldehyde $(CH_3CHO)$ as product

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Acetone

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(C) Step $1$: Hydration of ethyne $(HC \equiv CH)$ in the presence of $1\% \, HgSO_4$ and $20\% \, H_2SO_4$ yields acetaldehyde $(CH_3CHO)$ as product $A$.Step $2$: Reaction of acetaldehyde $(CH_3CHO)$ with Grignard reagent $(CH_3MgX)$ followed by hydrolysis yields isopropyl alcohol $(CH_3CHOHCH_3)$ as product $B$.Step $3$: Oxidation of isopropyl alcohol $(CH_3CHOHCH_3)$ using an oxidizing agent $([O])$ yields acetone $(CH_3COCH_3)$.

The end product in the following sequence of reaction is
$HC \equiv CH$ $\xrightarrow{1\% \, HgSO_4, 20\% \, H_2SO_4} A$ $\xrightarrow{CH_3MgX} B$ $\xrightarrow{[O]}$

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The end product in the following sequence of reaction is$HC \equiv CH$ $\xrightarrow{1\% \, HgSO_4, 20\% \, H_2SO_4} A$ $\xrightarrow{CH_3MgX} B$ $\xrightarrow{[O]}$