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

Benzene

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Nitrobenzene

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Toluene

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Chlorobenzene

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Solution

The correct option is B Nitrobenzene
$- N O_{2}$ group is highly deactivating and thus, deactivates the ring towards electrophilic substitution. Hence, sulphonation of nitrobenzene is most difficult.

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