The reagent that bring about conversions of benzyl chloride to phenyl methanamine is

Options

A. `(n-Ba)_2N`
B. excess `NH_3` pyridine
C. `AgNO_3`
D. alc,KCN

Answer

To convert benzyl chloride to phenylmethanamine, we can follow these steps:

### Step 1: Identify the Reactants
- We start with **benzyl chloride** (C6H5CH2Cl) as our starting material.

### Step 2: Determine the Product
- The desired product is **phenylmethanamine** (C6H5CH2NH2).

### Step 3: Choose the Reagent
- The reagent needed for this conversion is **ammonia (NH3)** in the presence of a base like **pyridine**. Pyridine acts as a solvent and helps in the reaction.

### Step 4: Mechanism of Reaction
1. **Nucleophilic Attack**: The ammonia molecule acts as a nucleophile and attacks the carbon atom in benzyl chloride that is bonded to chlorine. This carbon is electrophilic due to the presence of the chlorine atom.

2. **Formation of Intermediate**: The attack leads to the formation of a tetrahedral intermediate where the nitrogen from ammonia is now bonded to the carbon that was previously bonded to chlorine.

3. **Elimination of Chloride Ion**: The tetrahedral intermediate collapses, and the chloride ion (Cl-) is expelled. This results in the formation of phenylmethanamine.

### Step 5: Final Product
- The final product after the reaction is **phenylmethanamine (C6H5CH2NH2)**, and hydrochloric acid (HCl) is released as a byproduct.

### Summary of Reaction:
Benzyl chloride + Ammonia (in pyridine) → Phenylmethanamine + HCl