Hydrocarbons - Result Question 67
####69. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
(a) $-SO_3 H$
(b) $-COOH$
(c) $-NO_2$
(d) $-C \equiv N$
[NEET 2013]
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Solution:
- (c) Decreasing order of deactivating effect of the given $m$-directing group is
$>NO_2>-CN>-SO_3 H>-COOH$
$-NO_2$ group is most deactivating group due to strong $-E,-I$ and $-M$ effects.
