Idetify A,B, C, …..
`CH_(3)CHOoverset(PCl_(5))to A overset(aq. KOH)to B underset(Cl_(2))overset(NaOH)to C(l) + D(aq.)`

Explanation

To solve the problem step by step, we will identify the compounds A, B, C, and D based on the reactions described.

### Step 1: Identify A
- We start with the compound **CH₃CHO**, which is acetaldehyde.
- When acetaldehyde reacts with **PCl₅** (phosphorus pentachloride), it replaces the hydroxyl group (–OH) with chlorine (–Cl) to form **CH₃CHCl₂**.
- Therefore, **A = CH₃CHCl₂** (1,1-dichloroethane).

### Step 2: Identify B
...