Which of the following reactions form benzylamine:

Options

A.
B. `C_6 H_5 CONH_2 overset(NaOBr)to`
C. `C_6H_5CN overset(H^(+)//H_2 O)to`
D.

Answer

To determine which reactions form benzylamine, we will analyze the provided options step by step. Benzylamine is represented by the structure C6H5CH2NH2, which consists of a benzene ring (C6H5) attached to a CH2 group and an NH2 group.

### Step-by-Step Solution:

1. **Identify Benzylamine Structure**:
- Benzylamine has the formula C6H5CH2NH2. It consists of a benzene ring (C6H5) attached to a methylene group (CH2) and an amino group (NH2).

2. **Analyze the Reactions**:
- We need to look at the reactions provided in the options and see if they can lead to the formation of benzylamine.

3. **Reaction A**:
- If the reaction involves reducing a carbonyl group (C=O) to a methylene group (CH2) while introducing an amino group (NH2), this could lead to the formation of benzylamine.
- For example, if we start with a compound like C6H5C(O)R and reduce it with a reducing agent like LiAlH4, it can yield C6H5CH2NH2.

4. **Reaction B**:
- If the reaction involves a nitrile group (C≡N) on the benzene ring undergoing acidic hydrolysis, it will yield benzoic acid (C6H5COOH) and ammonium ion (NH4+). This does not lead to benzylamine.

5. **Reaction C**:
- If thalamide reacts with a benzyl halide (C6H5CH2Br) in the presence of a base (like KOH), it can lead to the formation of benzylamine after hydrolysis.
- The reaction mechanism involves nucleophilic substitution where the thalamide anion attacks the benzyl halide, followed by hydrolysis to yield benzylamine.

6. **Conclusion**:
- Based on the analysis, the reactions that can form benzylamine are:
- **Option A** (Reduction of a carbonyl compound to yield CH2 and NH2)
- **Option D** (Thalamide reaction with benzyl halide followed by hydrolysis).

### Final Answer:
- The reactions that form benzylamine are **Option A and Option D**.