Consider the given chemical reaction :

 Product ''A'' is : 

CONCEPT:

Oxidative Cleavage of Cycloalkenes

• Oxidative cleavage involves breaking the carbon-carbon double bond of a cycloalkene using strong oxidizing agents like KMnO₄ in acidic conditions.
• This reaction typically leads to the formation of dicarboxylic acids, depending on the structure of the cycloalkene.
• The reaction mechanism involves the addition of oxygen atoms to the double bond, followed by cleavage and oxidation of the resulting fragments.

EXPLANATION:

• In the given reaction, cyclohexene is oxidized by KMnO₄ in the presence of H₂SO₄ (acidic medium) under heat.
• This leads to the oxidative cleavage of the double bond and formation of adipic acid, which is a six-carbon dicarboxylic acid.
• Thus, the product "A" formed in the reaction is adipic acid, corresponding to option (4).

The correct answer is option (4): Adipic acid.