JEE Main Chemistry question

Chemistry Haloalkanes and Haloarenes JEE Main

The correct order of increasing reactivity of the C–X bond towards nucleophilic substitution among PhX (I), *p*-O₂N–C₆H₄–X (II), (CH₃)₃C–X (III) and (CH₃)₂CH–X (IV) is

(A)I < II < IV < IIICorrect
(B)II < III < I < IV
(C)IV < III < I < II
(D)III < II < I < IV

Answer: (A)

Solution

Simple aryl halides (I) are essentially unreactive to nucleophilic substitution because of C–X π-character and poor backside access. A *para*-nitro group (II) activates the ring for the (different, addition–elimination) nucleophilic aromatic substitution

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Question ID VK-140038