InterviewSolution
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InterviewSolution
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Consider the following reactiions: Which of the staements are correct?A. Reaction `(I)` is faster than `(II)`.B. Reaction `(II)` is faster than `(I)`.C. Reaction `(III)` is faster than `(IV)`.D. Reaction `(Iv)` is faster than `(III)`. |
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Answer» Correct Answer - `(a,d)` i. Althiough `F^(o-)` is a poor leaving group, in acidic condition, `F` froms `H-` bonding and its departure is easier. So in acidic medium, reaction `(I)` is solvolysed faster than `(II)`. This is an example of electrophilic catalysis. ii. The formation of `Me_(3)C - underset(Me)underset(|)overset(Me)overset(|)(C^(o+))` from `(IV)` reduces some of the streic hindreance or crowding in reactant in `(IV)`, induced by the two `(Me)` groups and the `t-Bu` on the `alpha-C` atom. This is an example of steric acceleration. Moreover, carbocation is further stabilised by `+1` effect of two `(Me)` groups and `t-Bu` groups. So reaction `(IV)` is faster than `(III)` |
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