1.

Which of the following order is not correct?

Answer»

`MeBr GT Me_2CHBr gt Me_3CBr gt Et_3CBr(S_N2)`
`PhCH_2Br gt PhCHBrMe gt PhCBrMe_2 gt PhCBrMePh(S_N1)`
`Mel gt MeBr gt MeCl gt MEF(S_N2)`
All the above are correct

Solution :The more is the stability of intermediate carbonium ion, the more is the chance of `S_N1` mechanisın. The intermediates obtained will be `PH overset(+)CH_2` (i),`Phoverset(+)CH-Me` (ii), `Phoverset.(+)C-Me_2` (iii), `Phoverset(+)C-MePh`(IV). The stabilty is of the ORDER iv > iii > ii > i.


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