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Q.

Which of the following species parricipates in sulphonation of benzene ring?

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a

SO2−

b

SO3

c

HSO3−

d

H2SO4

answer is B.

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Detailed Solution

Sulphur trioxide SO3​ is active species in sulfonation of benzene.SO3​ acts as an electrophile and accepts a pair of pi electrons from benzene.
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