Haloalkanes And Haloarenes Ques 41
41. The correct order of increasing reactivity of $C-X$ bond towards nucleophile in the following compounds is:
[2010]
(I)$\quad$ (II)$\quad$ (III)$\quad$ (IV)
(a) I $<$ II $<$ IV $<$ III
(b) II $<$ III $<$ I $<$ IV
(c) IV $<$ III $<$ I $<$ II
(d) III $<$ II $<$ I $<$ IV
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Answer:
Correct Answer: 41.(a)
Solution:
- (a) Tertiary alkyl halide is most reactive towards nucleophilic substitution because the corresponding carbocation $(3^{\circ})$ is most stable. Aryl halide is least reactive due to partial double bond character of the $C-Cl$ bond.
Presence of - $NO_2$ groups in ortho and para positions increases the reactivity of the $-Cl$ towards nucleophiles.
BETA
