Consider an endothermic reaction $X \to Y$ with the activation energies $E_b$ and $E_f$ for the backward and forward reactions,respectively. In general:
- A$E_b < E_f$
- B$E_b > E_f$
- C$E_b = E_f$
- DThere is no definite relation between $E_b$ and $E_f$
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