Which reagents among the following can affect the conversion ?
`CH_(3) C-=N to CH_(3)CH_(2)NH_(2)`

Options

A. `H_(2), Pt`
B. Ammoniacal `AgNO_(3)`
C. `LiAlH_(4)`
D. `NaBH_(4)`

Answer

To convert the compound \( CH_3C \equiv N \) (which is a nitrile) to \( CH_3CH_2NH_2 \) (which is an amine), we need to consider the reagents that can facilitate this transformation. The conversion involves reducing the nitrile group to an amine.

### Step-by-Step Solution:

1. **Identify the Starting and Ending Compounds:**
- Starting compound: \( CH_3C \equiv N \) (nitrile)
- Ending compound: \( CH_3CH_2NH_2 \) (primary amine)

2. **Understand the Reaction Type:**
- The conversion from a nitrile to a primary amine involves a reduction reaction where the triple bond (C≡N) is reduced to a single bond (C-NH2).

3. **Evaluate the Reagents:**
- **Option A: \( H_2 \) in the presence of Platinum (Pt)**
- This is a hydrogenation reaction. The presence of platinum as a catalyst allows for the addition of hydrogen across the triple bond, converting the nitrile to an amine.
- **Conclusion:** This reagent can affect the conversion.

- **Option B: Ammonical AgNO3 (Tollens' reagent)**
- Tollens' reagent is primarily used for the detection of aldehydes and does not react with nitriles.
- **Conclusion:** This reagent cannot affect the conversion.

- **Option C: Lithium Aluminum Hydride (LiAlH4)**
- Lithium Aluminum Hydride is a strong reducing agent that can reduce nitriles to primary amines effectively.
- **Conclusion:** This reagent can affect the conversion.

- **Option D: Sodium Borohydride (NaBH4)**
- Sodium Borohydride is a milder reducing agent that primarily reduces carbonyl compounds (aldehydes and ketones) and does not effectively reduce nitriles.
- **Conclusion:** This reagent cannot affect the conversion.

4. **Final Answer:**
- The reagents that can affect the conversion of \( CH_3C \equiv N \) to \( CH_3CH_2NH_2 \) are:
- \( H_2 \) in the presence of Platinum (Option A)
- Lithium Aluminum Hydride (Option C)