Which of the following groups will facilitate the electrophilic attack on benzene ring?

- {N O}_{2}

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- C H O

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- C l

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- {S O}_{3} H

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Solution

The correct option is C $- C l$
All the species which are given perform a nucleophilic attack on benzene except chlorine. All the species are ortho meta deactivating group. Chlorine shows +R effect and -I effect and because of it facilitates an electrophilic attack on a benzene ring.

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- C O O H, - C N, - N H_{2} - C O C H_{3}, - N H C O C H_{3}, - O H, - C H O, - S O_{3} H, - C l, - N O_{2}

H N O_{3}

H_{2} S O_{4}

^{⨁} N O_{2}

^{⨁} N O_{2}

o, p -

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