Answer

Correct option: D.
Gattermann reaction
d
The given reaction is known as Gattermann reaction.In this reaction, aromatic compound such as benzene or phenol is treated with a mixture of $HCN$ and dry $HCl$ gas under pressure and in the presence of anhydrous aluminum chloride or zinc chloride to introduce a formyl group in the aromatic nucleus.

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$C_6H_6$ $\xrightarrow[AlC{{l}_{3}}]{\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||  \\
   {{(C{{H}_{3}})}_{2}}CH-C-Cl  \\
\end{matrix}}$  $\xrightarrow[reduction]{Clemmensen}$  $\xrightarrow[AlC{{l}_{3}}]{\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{3}}-C-Cl  \\
\end{matrix}}$ $\xrightarrow[{{H}_{3}}{{O}^{\oplus }}]{\operatorname{Re}d\,\,\,P\,+\,HI}$ (Ibuprofen)

Ibuprofen is