JEE MAIN - Chemistry (2017 (Offline) - No. 8)

The increasing order of the reactivity of the following halides for the SN1 reaction is :

JEE Main 2017 (Offline) Chemistry - Haloalkanes and Haloarenes Question 145 English
(II) < (I) < (III)
(I) < (III) < (II)
(II) < (III) < (I)
(III) < (II) < (I)

Explanation

Since SN1 reactions involve the formation of carbocation as intermediate in the rate determining step, more is the stability of carbocation higher will be the reactivity of alkyl halides towards SN1 reaction.

JEE Main 2017 (Offline) Chemistry - Haloalkanes and Haloarenes Question 145 English Explanation
Hence correct order is II < I < III.

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