Question

\(\text{C}=\text{O}_{\text{(Carbonyl group in aldehydes and ketones)}}+4[H]\xrightarrow[\Delta ]{\text{Zn-Hg, conc. HCl}}\underset{\text{(Methylene group)}}{-\text{CH}_{2}}+\text{H}_{2}\text{O}\)
Identify the name of above reaction.

• A. Mendius reduction
• B. Clemmensen Reduction
• C. Wolf-Kishner reduction
• D. Hofmann degradation

Hint:

Reduction of C=O to CH2 with zinc amalgam and concentrated HCl is a named reaction.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
The reaction converts a carbonyl group into a methylene group using \(\text{Zn-Hg}\) and concentrated \(\text{HCl}\).

Step 2: Recall Named Reactions
Clemmensen reduction uses zinc amalgam and concentrated HCl.
Wolff-Kishner reduction uses hydrazine and KOH in ethylene glycol.

Step 3: Compare the options
The given reagents correspond to Clemmensen reduction, option (B).

Final Answer:
The reaction is Clemmensen reduction. \[ \boxed{\text{(B) }\text{Clemmensen Reduction}} \]