Structure of A, based on the following reaction, is

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CSIR-UGC (NET) Chemical Science: Held on (18 Sept 2022)
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Concept:

Bayer's reagent, also known as alkaline potassium permanganate, is a solution used to test for the presence of unsaturation (double or triple bonds) in organic compounds.

Explanation:

  • Alkaline KMnO4 acts as Bayers reagent which involves the reduction of the permanganate ion (MnO4-) to manganese dioxide (MnO2), while the alkene is oxidized to form the 1,2-diol.

  • 1,2-diol undergoes rearrangement and then oxidised to carboxylic acid in the presence of alk.KMnO4. Alk. KMnO4 acts as strong oxidizing agent which involves conversion of alcohol, aldehydes and ketones to their corresponding carboxylic acids.

Conclusion:

Hence, the reactant involves in the reaction is 2,2-dimethyl-3-methylidenebicyclo-[2,2,1]heptane.

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