Assertion : Alkyl iodide can be prepared by treating alkyl chloride/bromide with Nal in acetone .
Reason : NaCI/NaBr are soluble in acetone while Nal is not .

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reasonb is false
D. If both assertion and reason are false.

Answer

C

Explanation

This is Finkelstin reaction which involves the conversion of an alkyl chloride/bromide to an alkyl iodide by the addition of sodium iodide in acetone. Because sodium iodide is soluble in acetone and NaCl and NaBr are not, the equilibrium is shifted by the precipitation of insoluble salt.
`R - X overset(MX')underset(MX)hArr R-X'`
The equilibrium position of the reaction depends on the nucleophilicity of the anion, whether a good leaving group is present and whether one anion is better stabilised than the other in a given solvent.