JEE Advanced | 2013General Organic ChemistryHard
Question
KI in acetone, undergoes SN2 reaction with each of P, Q, R and S. The rates of the reaction vary as -
Options
A.P > Q > R > S
B.S > P > R > Q
C.P > R > Q > S
D.R > P > S > Q
Solution
(SN2 Reaction)Reaction takes place via formation of pentavalent C-transition state.
Transition state is stabilised by electron withdrawing group like
& not stabilised by electrondonating group like -CH3So order of given compound for SN2 reaction
> CH3-Cl > CH2 = CH-CH2-Cl > 
hence, Answer is (B)
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