Which of the compound on reaction with ` Li AIH_4 ` gives ethyl amine ?

Options

A. Acetamide
B. Acetonitrile
C. Cyanomethane
D. All of these

Answer

To determine which compound reacts with lithium aluminum hydride (LiAlH4) to produce ethylamine, we need to analyze the reaction of LiAlH4 with different types of compounds.

### Step-by-Step Solution:

1. **Understanding LiAlH4**:
- Lithium aluminum hydride (LiAlH4) is a powerful reducing agent. It can reduce carbonyl compounds (like aldehydes and ketones), esters, and amides to their corresponding alcohols or amines.

2. **Identifying the Target Product**:
- We want to produce ethylamine (C2H5NH2). Ethylamine can be formed from the reduction of an amide or a nitrile.

3. **Analyzing the Compounds**:
- **Amide**: If we take an amide such as ethyl carbamate (CH3CH2CONH2), the reaction with LiAlH4 will reduce the carbonyl group (C=O) to a methylene group (–CH2–), resulting in ethylamine:
\[ \text{CH3CH2CONH2} + \text{LiAlH4} \rightarrow \text{CH3CH2NH2} + \text{byproducts} \]
- **Nitrile**: Similarly, if we consider a nitrile like acetonitrile (CH3CN), the reaction with LiAlH4 will convert the nitrile to an amine:
\[ \text{CH3CN} + \text{LiAlH4} \rightarrow \text{CH3CH2NH2} + \text{byproducts} \]

4. **Conclusion**:
- Both an amide and a nitrile can be reduced by LiAlH4 to yield ethylamine. Therefore, if the question provides options that include an amide or a nitrile, those options would be correct.

5. **Final Answer**:
- The correct answer is that both the amide and the nitrile can react with LiAlH4 to produce ethylamine. If the options provided include these compounds, then they are all correct.