The reaction
`R_(2)C=N``NH_(2)overset(C_(2)H_(5)Ona)rarrR_(2)CH_(2)+N_(2)` is called

Options

A. Clemmensen reduction
B. Hunsdiecker reaction
C. Tischenko reaction
D. Wolff-Kishner reduction.

Explanation

To solve the question regarding the reaction \( R_2C=N\text{NH}_2 \overset{C_2H_5O^-}{\rightarrow} R_2CH_2 + N_2 \), we need to identify the name of the reaction.

### Step-by-Step Solution:

1. **Identify the Reactants and Products**:
- The reactant is \( R_2C=N\text{NH}_2 \) (a hydrazone).
- The product is \( R_2CH_2 \) (an alkane) and \( N_2 \) (nitrogen gas).

2. **Understanding the Reaction**:
- The reaction involves the conversion of a hydrazone into an alkane with the release of nitrogen gas.
- This type of reaction typically involves the reduction of a carbon-nitrogen double bond.

3. **Relate to Known Reactions**:
- This reaction is known to be part of the Ulf-Kistner reduction. The Ulf-Kistner reduction is a method used to reduce carbonyl compounds (like aldehydes and ketones) to hydrocarbons using hydrazine and a base.

4. **Final Conclusion**:
- The reaction \( R_2C=N\text{NH}_2 \overset{C_2H_5O^-}{\rightarrow} R_2CH_2 + N_2 \) is called the **Ulf-Kistner reduction**.