NEET 2013 Chemistry question

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

(1)
(2)
(3)
(4)Correct

Answer: (4)

Solution

A meta-directing group deactivates the ring by withdrawing electron density through the and effects; the more strongly it withdraws, the greater the deactivation. The group, with a formally positive nitrogen bonded to two electronegative

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Question ID VK-091377