JEE Advance - Chemistry (2013 - Paper 1 Offline - No. 9)
KI in acetone, undergoes SN2 reaction with each of P, Q, R and S. The rates of the reaction vary as
P > Q > R > S
S > P > R > Q
P > R > Q > S
R > P > S > Q
Explanation
The bulky groups cause steric hindrance in the formation of transition state. Therefore, higher homologues (Q) are less reactive than lower homologues (P). In compound (S), the transition state is highly stabilized by Ph-(C=O)- group, so it has highest rate of reaction towards SN2.
The relative reactivities towards SN2 reaction S > P > R > Q.
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