Identify A, B and C in the following reactions.
`C_6H_5COOHoverset(PCl_5)toA overset(NH_3)to B overset(P_2O_5)toC_6H_5CNoverset(H_2,Ni)toC`

Explanation

To solve the problem, we need to identify the compounds A, B, and C in the given reactions step by step.

### Step 1: Identify Product A
The first reaction involves benzoic acid (C₆H₅COOH) reacting with phosphorus pentachloride (PCl₅).

- **Reaction**:
\[
C_6H_5COOH + PCl_5 \rightarrow C_6H_5COCl + POCl_3 + HCl
...