Identify the compounds from the following which from primary amines under suitable reduction conditions:
(I) `C_(2)H_5 NC` (II) `C_2H_6`
(III) `C_2H_5CONH_2` (IV) `C_2H_5NO_2`

Options

A. I, IV
B. III, IV
C. I,II,IV
D. II,III, IV

Explanation

To identify which of the given compounds can form primary amines under suitable reduction conditions, we will analyze each compound one by one.

### Step 1: Analyze Compound (I) - Ethyl Isocyanide (`C2H5NC`)
- Ethyl isocyanide can be represented as `CH3CH2-N≡C`.
- Upon reduction using a strong reducing agent like Lithium Aluminium Hydride (LiAlH4), the isocyanide group (N≡C) will be reduced.
- The nitrogen will bond with two hydrogen atoms and the carbon chain, resulting in a secondary amine (`CH3CH2-NH-CH3`).
- **Conclusion**: This compound does not form a primary amine.

### Step 2: Analyze Compound (II) - Ethane (`C2H6`)
- Ethane is a saturated hydrocarbon with the formula `CH3-CH3`.
- Since it is already fully saturated with hydrogen, there are no functional groups to reduce.
- **Conclusion**: No amine can be formed from ethane through reduction.

### Step 3: Analyze Compound (III) - Ethylamide (`C2H5CONH2`)
- Ethylamide can be represented as `CH3CH2-C(=O)NH2`.
- To convert this to a primary amine, we can use reduction methods such as bromine with potassium hydroxide (Br2/KOH) or LiAlH4.
- The carbonyl group (C=O) will be removed, and we will obtain `CH3CH2-NH2`.
- **Conclusion**: This compound forms a primary amine.

### Step 4: Analyze Compound (IV) - Ethyl Nitrate (`C2H5NO2`)
- Ethyl nitrate can be represented as `CH3CH2-O-NO2`.
- Under suitable reduction conditions (e.g., using hydrogen in the presence of a catalyst like nickel), the nitro group can be reduced.
- This will lead to the formation of `CH3CH2-NH2`.
- **Conclusion**: This compound also forms a primary amine.

### Final Answer:
The compounds that form primary amines under suitable reduction conditions are:
- (III) Ethylamide (`C2H5CONH2`)
- (IV) Ethyl Nitrate (`C2H5NO2`)