Methane () reacts with chlorine in the presence of sunlight. If is replaced by deuterated methane () and tritium-substituted methane (), what is the correct order of the rate of the photochemical halo

Question

Methane ($CH_4$) reacts with chlorine in the presence of sunlight. If $CH_4$ is replaced by deuterated methane ($CD_4$) and tritium-substituted methane ($CT_4$), what is the correct order of the rate of the photochemical halogenation reaction?

Prashant Kotian · Accepted Answer

Correct answer: A. Due to the kinetic isotopic effect, the bond dissociation enthalpy increases with isotopic mass (). Therefore, the bond breaks much faster than the and bonds, making the most reactive.

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