The reaction of cyclohexane with potassium permanganate (\(\text{KMnO}_4\)) in an acidic medium (\(\text{H}_2\text{SO}_4\)) and heat results in the oxidation of cyclohexane to adipic acid.
Step 1: Oxidation of cyclohexane
Cyclohexane (\(\text{C}_6\text{H}_{12}\)) undergoes oxidation in the presence of \(\text{KMnO}_4\) and \(\text{H}_2\text{SO}_4\).
- The \(\text{KMnO}_4\) oxidizes the \(-\text{CH}_2-\) groups in cyclohexane to carboxylic acid (\(-\text{COOH}\)) groups.
- This results in the formation of adipic acid (\(\text{HOOC} - (\text{CH}_2)_4 - \text{COOH}\)).
\[\text{C}_6\text{H}_{12} \rightarrow [\text{KMnO}_4, \text{H}_2\text{SO}_4, \text{Heat}] \text{HOOC} - (\text{CH}_2)_4 - \text{COOH} \, (\text{Adipic Acid})\]
Step 2: Conclusion
The product \(A\) is adipic acid.
Final Answer: (4).