Assertion : Bond energy and bond dissociation energy have identical value for diatomic molecules. Reason : Greater the bond dissociation energy, less reactive is the bond.

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Bond dissociation energy is the energy required to break a particular bond in one mole of a gaseous molecule. Bond energy is the average values of dissociation energies of the same type of bond present in the molecule. Bond energy of C − H bond in methane is 99.2 kcal / mol . Thus for polyatomic molecules, average bond energy is taken as the dissociation bond energy.

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