Discuss the consequences of high enthalpy of H—H bond in terms of chemical reactivity of dihydrogen?



Owing to its high bond dissociation enthalpy of H—H bond (435-88 kj/mol) dihydrogen is quite stable.
It is because of this factor that the dissociation of dihydrogen into its atoms is only ~ 0-081% around 2000 K which increases to 95-5% at 5000 K.
It is found to be relatively inert at room temperature due to high H—H bond enthalpy.