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Question

Choose the correct option(s) for the given reaction


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Solution

The correct option is B


Explanation for correct option:

(A) and (B)

The question can be explained with detailed mechanism below:

  1. In the first step of the reaction, alkyne group is hydrolyze by using HgSO4 as a catalyst..
  2. The hydroxy product is oxidized to ketone by the action of AgNO3+NH4OH
  3. Then the Clemenson reduction takes place for reducing ketone into alkane.
  4. The carboxylic acid group is converted into carbonyl chloride group under the action of SOCl2/Py.
  5. The formation of product R takes place through Intramolecular Friedel Craft acylation.
  6. The formation of product S takes place through Clemenson reduction.

Explanation for incorrect option:

The above detailed mechanism proves that the option C is incorrect.

The above detailed mechanism proves that the option D is incorrect.

Hence, option A and B are correct.


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