The correct order of increasing reactivity of CX bond towards nucleophile in the following compounds is

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II < III < I < IV

IV < III < II < I

I < II < IV < III

III < II < I < IV

answer is A.

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Detailed Solution

The order of reactivity is dependent on the stability of the intermediate carbocation formed by cleavage of C-X bond. The $3^{0}$ carbocation (formed from III) will be more stable than its 2⁰ counter part (formed from IV) which in turn will be more stable than the arenium ion .Also the aryl halide has a double bond character CX bond which makes the cleavage more difficult. However, inspite of all the stated factors, II will be more reactive than I due to the presence of the electron with drawing $- {NO}_{2}$ group,C-X bond becomes weak and undergoes nucleophilic substitution reaction

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