Acetamide when heated with `PCl_5` gives

Options

A. `CH_3Cl`
B. `CH_3CN`
C. `CH_3"CCl"_2NH_2`
D. `CHCl_2CONH_2`

Answer

To solve the question regarding the reaction of acetamide with phosphorus pentachloride (PCl5), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- Acetamide (CH3CONH2) is the organic compound we are starting with.
- Phosphorus pentachloride (PCl5) is the reagent used in the reaction.

2. **Write the Reaction**:
- When acetamide is heated with PCl5, it undergoes chlorination and forms an amide chloride.
- The reaction can be represented as:
\[ \text{CH}_3\text{CONH}_2 + \text{PCl}_5 \rightarrow \text{CH}_3\text{CCl}_2\text{NH}_2 + \text{POCl}_3 \]

3. **Identify the Products**:
- The main product formed is **N-chloroacetamide** (CH3CCl2NH2).
- Additionally, phosphorus oxychloride (POCl3) is also produced as a byproduct.

4. **Final Reaction Equation**:
- The complete balanced reaction can be summarized as:
\[ \text{CH}_3\text{CONH}_2 + \text{PCl}_5 \rightarrow \text{CH}_3\text{CCl}_2\text{NH}_2 + \text{POCl}_3 \]

5. **Conclusion**:
- The product of the reaction between acetamide and phosphorus pentachloride is N-chloroacetamide (CH3CCl2NH2).