Periodic Table and Periodicity

Question

The correct order of bond dissociation enthalpy of halogens is :

Accepted Answer

Option B. Among halogens (F₂, Cl₂, Br₂ and I₂), bond dissociation enthalpy (…_dissH…) of I₂, is minimum because of larger size of I-atom there is a steric repulsion between bonded I-atoms, which makes I-I bond weakest.

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Periodic Table and Periodicity

More on Periodic Table and Periodicity