Question

For the electrophilic substitution reaction involving suphonation, which of the following sequence regarding the rate of reaction is true?

• A. $R_{C_6{H}_6}<R_{C_6{D}_6}<R_{C_6{T}_6}$
• B. $R_{C_6{H}_6}>R_{C_6{D}_6}>R_{C_6{T}_6}$
• C. $R_{C_6{H}_6}>R_{C_6{D}_6}<R_{C_6{T}_6}$
• D. $R_{C_6{H}_6}=R_{C_6{D}_6}=R_{C_6{T}_6}$

Answer 1

The correct option is B $R_{C_6{H}_6}>R_{C_6{D}_6}>R_{C_6{T}_6}$

We know that the C-H bond is the weakest, hence it requires less energy and therefore, the rate of reaction is also maximum.

Sulphonation involves the addition of $-S{O}_{3}H$ group to the carbon chain and is a reversible reaction.

Hence, the correct answer will be option B.