Engineering
Chemistry
Reaction Mechanism and Molecularity
Question

The potential energy diagram for a reaction X → Y is given. A and C in the graph corresponds to:

A → activation energy, C →  ΔH°

A → energy of reactants, C → energy of products

A → ΔH° C → activation energy

A → activation energy, C → threshold energy

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Solution
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Activation energy is defined as the least possible amount of energy (minimum) which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place → A .

C → ΔH° is the difference of the forward and backward activation energies. 
Hence, the correct answer is option A.
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