Mark the correct increasing order of reactivity of the following compounds with HBr/HCl. 

I. a < b < c

 

II. b < a < c

 

III. b < c < a

 

IV. c < b < a 

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p> (III) b &lt; c &lt; a&nbsp;</p><p>The reaction will proceed by SN¹ mechanism to form the carbocation intermediate, more the stability of carbocation more will be the reactivity of the given compound with HBr/HC1.</p><p>-NO₂ group is an electron withdrawing group and due to the -M effect, increases the stability of carbocation. Cl group at para position shows + M effect due to it, carbocation is least stable and hence, the compound (c)&nbsp; is the least reactive.</p>

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