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Haloalkanes and Haloarenes
Question
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The increasing order of the reactivity of the following halides for the SN1 reaction is

  • (III) < (II) < (I) 

  • (II) < (I) < (III)

  • (I) < (III) < (II)

  • (II) < (III) < (I)

Answer

B.

(II) < (I) < (III)

For any SN1 reaction, reactivity is decided by ease of dissociation of alkyl halide
R – X ⇌ R+ + X-
Higher the stability of R+ (carbocation) higher would be reactivity of SN1 reaction.Since the stability of cation follows the order.

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