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 -CH3
So order of given compound for SN2 reaction

> CH3-Cl > CH2 = CH-CH2-Cl >
hence, Answer is (B)

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