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Account for the following observations :...

Account for the following observations :
`t-BuF` is solvolysed only in very acidic solution.

Text Solution

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(a) `F^(Ө)` is poor leaving group, but H-bonding with a strong acid encourages its departure (called electrophilic catalysis).
(b)
The formation of (B) reduces some some of the steric crowding in (A) induced by two `Me` atoms and the t-Bu group on `alpha-C` atom. This is an example of steric acceleration.
(c) `F_(3)-overset(Me)overset(|)(CH^(o+))` is destabilised by the strongly `overline (e)- "withdrawing" (F_3C)` group, making the solvolysis of (B) slower.
(d) D-bonds are not as stabilising as H-bonds. In otehr words, `H_2 O` is a more polar solvent than `D_2 O` and being so, increases the rate of the `SN^1` solvolysis.
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