Chemical Kinetics And Nuclear Chemistry

Activation energy of both forward and backward reaction is $E_1+E_2$ and reactant is more stable than product.

Activation energy of forward reaction is $E_1+E_2$ and product is more stable than reactant.

Activation energy of backward reaction is $\mathrm{E}_1$ and product is more stable than reactant.

Activation energy of forward reaction is $E_1+E_2$ and product is less stable than reactant.