Clemenson's reaction is :

Options

A.
B. `C_6H_5-COCH_3+NH_2NH_2tooverset(C_2H_5ON)(to)C_6H_5CH_2CH_3`
C. `CH_3COCH_3+4HI overset(Red.P.)(to)CH_3CH_2CH_3`
D. All of the above

Answer

**Step-by-Step Solution for Clemenson's Reaction:**

1. **Understanding Clemenson's Reaction:**
Clemenson's reaction is a reduction process that specifically targets ketones. In this reaction, ketones are converted into alkanes.

2. **Reagents Involved:**
The key reagents used in Clemenson's reaction are zinc amalgam (a mixture of zinc and mercury) and hydrochloric acid (HCl).

3. **Mechanism of the Reaction:**
- When a ketone is treated with zinc amalgam in the presence of HCl, the zinc donates electrons to the carbonyl carbon of the ketone.
- This electron donation leads to the formation of a radical intermediate, where the oxygen atom of the carbonyl group becomes negatively charged.

4. **Formation of the Intermediate:**
- The negatively charged oxygen then forms a bond with zinc, creating a zinc-alkoxide intermediate.
- The HCl then protonates the alkoxide, leading to the cleavage of the C=O bond.

5. **Final Product Formation:**
- As a result of the cleavage, the ketone is reduced to an alkane.
- The overall transformation can be summarized as:
\[ \text{R}_2\text{C=O} + \text{Zn/Hg} + \text{HCl} \rightarrow \text{R}_2\text{CH}_2 + \text{ZnCl}_2 + \text{H}_2\text{O} \]

6. **Conclusion:**
Therefore, Clemenson's reaction effectively reduces ketones to alkanes using zinc amalgam and hydrochloric acid.

---