Q.

Which of the following statements is not correct for SN1 reactions?

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a

The reaction follows first-order kinetics

b

The nucliophile plays no role in the mechanism

c

The rate determining step is the conversion of transition state to the product.

d

The rate of reaction depends on the steric bulk of the alkyl group.

answer is C.

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Detailed Solution

(a) The rate expression is r = k [haloalkane] 

(b) Nucleophile is involved in the fast reaction.

( c) Substrate ~ Transition state is the slow step.

(d) Steric bulk favours  SN1mechanism.

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