Question
Chemistry Question on Haloalkanes and Haloarenes
Select the option(s) in which rate of SN1 is faster in II than I?
A
(A) 
B
(B) 
C
(C) 
D
(D) 
Answer
(A)
Explanation
Solution
Explanation:
Better the leaving group, more is the rate of SN1 reaction. Also, the more stable the cation, the higher is the rate of SN1 reaction. Iodide is a much better leaving group than chloride. Tertiary substrates (from the given) tend to undergo faster SN1 reactions. In the final option, it is an SN1 for a secondary versus primary substrates. Primary substrates hardly ever undergo SN1 without a suitable stabilizing factor (conjugation or a suitable neighbouring atom that stabilizes the carbocation formed etc.)