Write chemical reactions to affect the following transformations:
(i) Butan-1-ol to butanoic acid
(ii) Benzyl alcohol to phenylethanoic acid
(iii) 3 Nitrobromobenzene to 3-nitrobenzoic acid
(iv) 4-Methylacetophenone to benzene-1,4-dicarboxylic acid
(v) Cyclohexene to hexane-1,6-dioic acid
(vi) Butanal to butanoic acid.

Explanation

To solve the transformations from the question, we will write out the chemical reactions step by step for each transformation.

### (i) Butan-1-ol to Butanoic Acid
1. **Starting Compound**: Butan-1-ol (CH3CH2CH2CH2OH)
2. **Reagent**: Alkaline KMnO4 (strong oxidizing agent)
3. **Reaction**:
\[
\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{OH} \xrightarrow{\text{KMnO}_4} \text{CH}_3\text{CH}_2\text{CH}_2\text{C(=O)OH}
...