Question

Choose the correct option(s) for the given reaction

• A.
• B.
• C.
• D.

Answer 1

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 ${\mathrm{HgSO}}_4$ as a catalyst..
2. The hydroxy product is oxidized to ketone by the action of ${\mathrm{AgNO}}_3+{\mathrm{NH}}_4\mathrm{OH}$
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 ${\mathrm{SOCl}}_2/\mathrm{Py}$.
5. The formation of product $\mathrm{R}$ takes place through Intramolecular Friedel Craft acylation.
6. The formation of product $\mathrm{S}$ 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.