How will you convert :
(i) Benzoic acid to benzaldehyde (ii) Acetophenone to benzoic acid (iii) Ethanoic acid to 2-hydroxyethanoic acid ?

Explanation

To convert the given compounds, we will follow specific chemical reactions for each conversion. Here are the detailed steps for each conversion:

### (i) Conversion of Benzoic Acid to Benzaldehyde

1. **Starting Material**: Begin with benzoic acid (C6H5COOH).
2. **Formation of Acid Chloride**: Treat benzoic acid with thionyl chloride (SOCl2). This reaction replaces the hydroxyl (OH) group of the carboxylic acid with a chlorine (Cl) atom, forming benzoyl chloride (C6H5COCl).
\[
\text{C6H5COOH} + \text{SOCl2} \rightarrow \text{C6H5COCl} + \text{SO2} + \text{HCl}
...