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  4. Amongst the following, the compound which is most difficult to sulphonate is

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Q. Amongst the following, the compound which is most difficult to sulphonate is

Bihar CECEBihar CECE 2011Hydrocarbons

Solution:

$- NO _{2}$ group is highly deactivating and thus, deactivates the ring towards electrophilic substitution. Hence, sulphonation of nitrobenzene is most difficult.