The reaction involves the reduction of cyclohexanone using \( \text{LiAlH}_4 \), which reduces the carbonyl group to a hydroxyl group, resulting in compound A. The hydrogenation of A with \( \text{H}_2/\text{Pt} \) reduces the double bond, forming compound B, a cyclohexane derivative.
Identify the suitable reagent for the following conversion: $Ph-C(=O)-OCH_3$ $\longrightarrow$ $Ph-CHO$
Why is chlorobenzene resistant to nucleophilic substitution reactions?