An organic compound (A) of molecular weight 140.5 has 68.32%C, 6.4%H and 25.26% Cl. Hydrolysis of (A) with dilute acid gives compound (B), `C_(8)H_(10)O`. Compound (B) can be oxidised under mild condition to compound (C ), `C_(8)H_(8)O`. Compound (C ) forms a phenyl hydrazone (D ) iwth `PhNHNH_(2)` and gives a positive iodoform test. Give the structures of compounds (A) to (D)

Explanation

To solve the problem step by step, we will determine the structures of compounds A, B, C, and D based on the given information.

### Step 1: Determine the Empirical Formula of Compound A
1. **Given Percentages**:
- Carbon (C): 68.32%
- Hydrogen (H): 6.4%
- Chlorine (Cl): 25.26%

...