1.

The correct order of reactivity in S_(N^(1)) reaction for the following compounds is (i). CH_(3)-underset(Cl)underset(|)(C)H-CH_(2)-CH_(3) (ii). Ph-underset(Cl)underset(|)(C)H-CH_(2)-CH_(3) (iii). CH_(3)-underset(OC H_(3))underset(|)overset(Cl)overset(|)(C)-CH_(3) (iv). CH_(3)-CH_(2)-CH_(2)-Cl

Answer»

`(i)GT(II)gt(iii)gt(iv)`
`(ii)gt(i)gt(iii)gt(iv)`
`(iii)gt(ii)gt(i)gt(iv)`
`(iv)gt(iii)gt(ii)gt(i)`

Solution :This order of reactivity in `S_(N^(1))` reactions is DIRECTLY proportional to the relative STABILITIES of carbocations in the SLOW step. `therefore` the correct order of reactivity is:
IIIgtIIgtIgtIV


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