Doubt in nucleophilic addition

Please help with 2

Answer is B

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Help @Shwetanshu_2018 @Bhuvanitha_2020 @Samarth_2020

As of I remember there is a naming rxn with NaI in acetone (Finkelstein rxn)
It replaces halogen atom and forms iodide.
(Though iodine is better leaving group here is a satisfying reason why it replaces chlorine)

So you get ans B

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Ignore the above statement
So sry the above English statement is wrong:
“I-replaces cl/br atom “

sn2 mechanism is prefered hence b option

Thanks @Bhuvanitha_2020 Totally forgot about Finkelstein rxn.

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