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Question

(A) In electrophilic aromatic substitution,the rate-determining step for sulphonation is the removal of the proton (or deuteron/triton) from the sigma

Vedclass · Accepted Answer

$k_{C_6H_6} > k_{C_6D_6} > k_{C_6T_6}$

Vedclass · Answer

(A) In electrophilic aromatic substitution,the rate-determining step for sulphonation is the removal of the proton (or deuteron/triton) from the sigma complex intermediate. Since the $C-H$ bond is weaker than the $C-D$ bond,and the $C-D$ bond is weaker than the $C-T$ bond due to the primary kinetic isotope effect,the reaction rate is fastest for benzene $(C_6H_6)$ and slowest for tritiated benzene $(C_6T_6)$. Therefore,the correct order is $k_{C_6H_6} > k_{C_6D_6} > k_{C_6T_6}$.

For the electrophilic substitution reaction involving sulphonation,which of the following sequences regarding the rate of reaction is true?

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