Write the structures of A and B in the following reaction,
`CH_(3)COCl overset(H_(2),Pd-BaSO_(4))to A overset(H_(2)N-OH)toB`

Explanation

To solve the question, we need to identify the structures of compounds A and B in the given reaction sequence involving acetyl chloride (CH₃COCl).

### Step-by-Step Solution

1. **Identify the Starting Material:**
The starting material is acetyl chloride, which has the structure:
\[
\text{A: } \text{CH}_3\text{C(=O)Cl}
...