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What are X and Y in the following reacti...

What are X and Y in the following reactions ?

A

B

C

D

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The correct Answer is:
A
The given reactions are as follows :
Reaction 1, proceeds via `S_(N) 2 ` mechanism. The attack of nucleophile `[Nu^(o.)]` occurs from the backside and the leaving group leaves from the front side. In Reaction 2 , proceeds via `S_(N) 1 ` mechanism. where no inversion of product takes place.
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