Do the following conversions in not more than two steps:
(i) Benzoic acid to be to benzaldehyde
(ii) Ethyl benzene to Benzoic acid
(iii) Prapanone to Propene

Explanation

Let's break down the conversions step by step:

### (i) Benzoic acid to Benzaldehyde

**Step 1:** Convert benzoic acid (C6H5COOH) to benzoyl chloride using thionyl chloride (SOCl2).
- Reaction: C6H5COOH + SOCl2 → C6H5COCl + HCl
- Here, the hydroxyl group (-OH) of benzoic acid is replaced by a chlorine atom, forming benzoyl chloride (C6H5COCl).

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