Question

\[ \text{Write the product when cyclohexanecarbaldehyde reacts with }Zn(Hg)/conc.\;HCl. \]

Hint:

Aldehydes are generally more reactive than ketones towards nucleophilic addition. Clemmensen reduction converts carbonyl group into \(-CH_2-\) group.

Answer 1

Step 1: Identify the reagent.
Zn(Hg)/conc. HCl is the Clemmensen reduction reagent. It reduces the $C=O$ of an aldehyde or ketone to $-CH_2-$.
Step 2: Reaction.
\[C_6H_{11}CHO \xrightarrow{Zn(Hg)/\text{conc.}HCl} C_6H_{11}CH_3\] The $-CHO$ (aldehyde) is reduced to $-CH_3$.
Step 3: Product.
\[ \boxed{\text{Methylcyclohexane}\;(C_6H_{11}CH_3)} \]