Alkyl Halides and Aryl HalidesMedium
Question
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason (R).
Assertion (A) : 
undergoes $S_{N}2$ reaction faster than 
Reason (R) : iodine is a better leaving group because of its large size.
In the light of the above statements, choose the correct answer from the options given below:
Options
A.Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$
B.Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is not the correct explanation of $\mathbf{A}$
C.$\mathbf{A}$ is true but $\mathbf{R}$ is false
D.$\mathbf{A}$ is false but $\mathbf{R}$ is true
Solution
Sol. [Key Concept: Assertion–Reason — SN2 rate and the leaving-group ability of iodine]
Rate of $S_{N}2$ reaction of 
I is faster than 
Because iodine is a good leaving group due to large size of iodine. Which stabilises the I- ion.
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