Question

In the given reaction sequence, conversion of Acetophenone (\( C_6H_5COCH_3 \)) to Ethylbenzene (\( C_6H_5CH_2CH_3 \)) is an example of: \[ \text{CH}_3\text{COC/} \] \[ \text{Anhy. AlCl}_3 \xrightarrow{\text{X}} \xrightarrow{\text{(1) N}_2\text{H}_4} Y \] \[ \Delta \xrightarrow{\text{(2) KOH / glycol}} \]

• A. Clemmensen reduction
• B. Stephen reduction
• C. Wolff-Kishner reduction
• D. Rosenmund reduction

Hint:

For complete removal of carbonyl oxygen, use Wolff-Kishner reduction, especially when zinc amalgam (Clemmensen reduction) is unsuitable.

Answer 1

The Correct Option is C

Step 1: Understanding the Reaction Sequence The given reaction sequence involves the conversion of acetophenone (\( C_6H_5COCH_3 \)) into ethylbenzene (\( C_6H_5CH_2CH_3 \)), meaning it involves complete reduction of the carbonyl group to an alkane. Step 2: Identifying the Reduction Method The Wolff-Kishner reduction is a well-known method for converting ketones to alkanes via the following steps: 1. Formation of hydrazone by treating the ketone with hydrazine (\( N_2H_4 \)). 2. Heating with KOH in glycol, leading to complete removal of oxygen and formation of the corresponding alkane. Conclusion Thus, the correct answer is: \[ \text{Wolff-Kishner reduction} \]