1.

The increasing order of the reactivity of the following halides for the S_(N^(1)) reaction is: underset(I)(CH_(3)underset(Cl)underset(|)(C)HCH_(2)CH_(3))" "underset(II)(CH_(3)CH_(2)CH_(2)Cl)" "underset(III)(p-H_(3)COC_(6)H_(4)CH_(2)Cl).

Answer»

`(I)lt(III)lt(II)`
`(II)lt(III)lt(I)`
`(III)lt(II)lt(I)`
`(II)lt(I)lt(III)`

Solution :In `S_(N^(1))` MECHANISM, the reactivity ORDER is linked with the relative stabilities of the carbocations in the slow STEP. In the present case, the alkyl halides ionise as follows:
.
The CORRECT order `(II) lt (I)lt (III)`.


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