Hydrocarbons - Result Question 67

####69. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

(a) −SO3H

(b) −COOH

(c) −NO2

(d) −C≡N

[NEET 2013]

Show Answer

Solution:

  1. (c) Decreasing order of deactivating effect of the given m-directing group is

>NO2>−CN>−SO3H>−COOH

−NO2 group is most deactivating group due to strong −E,−I and −M effects.

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