Select the reagent used and the intermediate formed in stephen reaction

Options

A.
B.
C.
D.

Answer

**Step-by-Step Solution:**

1. **Understanding the Stephen Reaction**: The Stephen reaction is a method used to convert nitriles (R-CN) into aldehydes (R-CHO) using stannous chloride (SnCl2) in the presence of hydrochloric acid (HCl) and water (H2O).

2. **Identifying the Reagent**: The main reagent used in the Stephen reaction is stannous chloride (SnCl2). This reagent acts as a reducing agent in the reaction.

3. **Reaction Conditions**: The reaction is typically carried out in an acidic medium, which is provided by hydrochloric acid (HCl). Water (H2O) is also present in the reaction mixture to facilitate the conversion.

4. **Formation of the Intermediate**: The intermediate formed during the Stephen reaction is an imine (R-CH=NH). This intermediate is formed when the nitrile (R-CN) is reduced to an imine before being hydrolyzed to yield the final aldehyde product.

5. **Final Product**: The final product of the Stephen reaction is an aldehyde (R-CHO), which is obtained after hydrolysis of the imine intermediate.

**Summary**:
- **Reagent Used**: Stannous Chloride (SnCl2), HCl, and H2O
- **Intermediate Formed**: Imine (R-CH=NH)

---