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  4. Presence of a nitro group in a benzene ring

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Q. Presence of a nitro group in a benzene ring

AIEEEAIEEE 2007Organic Chemistry – Some Basic Principles and Techniques

Solution:

$- NO_2$ group shows - M effect, so withdraws the electron density from the ring and hence deactivate the ring towards electrophilic aromatic substitution.
Hence, (4) is correct.