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Question

Amongst the following, the compound which is most difficult to sulphonate is:

A
Benzene
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B
Nitrobenzene
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C
Toluene
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D
Chlorobenzene
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Solution

The correct option is B Nitrobenzene
NO2 group is highly deactivating and thus, deactivates the ring towards electrophilic substitution. Hence, sulphonation of nitrobenzene is most difficult.

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