Which of the following is the correct order of reactivity towards sulphonation?
(A)C6D6>C6H6>C6T6 (B)C6H6>C6D6>C6T6

(C) C6H6=C6D6=C6T6 (D)C6H6<C6D6<C6T6

Option B is correct. Sulphonation reaction is an electrophilic substitution reaction and for which the H or  D or T should be easily removed and is substituted by SO3H. The bond strength is in the order C-T > C-D > C-H. 
So C-H bond is easily cleaved and is substituted readily. Thus the order of sulphonation is C6H6>C6D6>C6T6

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