Question

Sol. [Key Concept: Oxidative cleavage of an alkene]

Under the intended strong acidic KMnO₄ oxidation conditions, each carbon of the shown C₆H₁₁–CH=CH–C₆H₁₁ double bond bears one hydrogen and is oxidised to a carboxyl group. Cleavage therefore gives two molecules of cyclohexanecarboxylic acid, C₆H₁₁COOH, matching option (4). The aldehyde would be oxidised further under these conditions.