Reduction of `gtC=O` to `CH_(2)` can be carried out with

Options

A. Catalytic reduction
B. `Na//C_(2)H_(5)OH`
C. `NH_(2)NH_(2)//KOH`
D. `LiAlH_(4)`.

Explanation

To reduce a carbonyl compound (C=O) to a hydrocarbon (specifically to CH2), we can use specific reagents that facilitate this transformation. The reduction of carbonyl compounds can be achieved through various methods, two of the most common being the Clemenson reduction and the Wolf-Kishner reduction.

### Step-by-Step Solution:

1. **Identify the Functional Group**:
- The compound we are starting with has a carbonyl group (C=O), which can be an aldehyde or a ketone.

2. **Determine the Target Product**:
- The target product is CH2, indicating that we need to remove the oxygen from the carbonyl group and add two hydrogen atoms.

3. **Choose the Reduction Method**:
- There are two main reduction methods for converting carbonyl compounds to hydrocarbons:
- **Clemenson Reduction**: This method uses zinc amalgam (Zn(Hg)) in the presence of hydrochloric acid (HCl).
- **Wolf-Kishner Reduction**: This method uses hydrazine (NH2-NH2) in the presence of a strong base like potassium hydroxide (KOH) and a solvent like ethylene glycol.

4. **Select the Appropriate Reagent**:
- Given the options, if the reagent for the Wolf-Kishner reduction (NH2-NH2 with KOH) is provided, then this is the correct choice for reducing the carbonyl compound to CH2.

5. **Conclusion**:
- Therefore, the reduction of the carbonyl compound (C=O) to CH2 can be effectively carried out using the Wolf-Kishner reduction method with the appropriate reagents.

### Final Answer:
The reduction of `gtC=O` to `CH2` can be carried out with **NH2-NH2 in the presence of KOH** (Wolf-Kishner reduction).

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