Arrange the compounds in increasing order of the rate of reaction towards nucleophilic substitution.

(i) (a) < (b) < (c)

(ii) (c) < (b) < (a)

(iii) (a) < (c) < (b)

(iv) (c) < (a) < (b)

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p>The Correct Answer is Option (iii).</p><p>Due to the resonance stabilisation of the benzene ring, the reactivity of aryl halides to nucleophilic substitution is exceedingly low. Because of resonance, the <strong>-Cl</strong> bond gains a partial double bond. The presence of an electron withdrawing <strong>-NO₂</strong> group at ortho or para positions on the ring enhances the reactivity of aryl halides. The presence of <strong>-NO₂</strong> near the <strong>C-Cl</strong> makes the molecule more reactive. The order of reactivity should be (b) &gt; (c) &gt; &nbsp; (a). The right option is (iii).</p>

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