Q.

Identify the incorrect statement

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a

'-NO2' group at meta position will not cause any effect towards the reactivity of chlorobenzene towards nucleophilic substitution reactions

b

halogen atoms are ring activating and ortho and para directing when attached to benzene ring towards electrophilic substitution reactions.

c

chlorobenzene is less reactive towards ‘SN’ reactions

d

Electrophilic substitution reactions are slow in chlorobenzene than in benzene.

answer is C.

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Detailed Solution

Halogen attached to a benzene ring is somewhat deactivating due to it's -I-effect, as a result it tends to withdraw the electrons from the benzene ring, making electrophilic substitution, ortho/ para directors are positively charged so halogens, being ortho/ para directors, are positively charged.

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