Identify A and B in the following sequence :
`CH_3COOC_2 H_5 overset(NH_3)to A overset(Br_2 //KOH)to B `

Explanation

To solve the question, we need to identify the compounds A and B in the given sequence:

1. **Starting Compound**: The initial compound is CH₃COOC₂H₅, which is an ester (ethyl acetate).

2. **Step 1: Reaction with NH₃**:
- When an ester reacts with ammonia (NH₃), it undergoes a reaction that produces an amide and an alcohol.
- The general reaction can be represented as:
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