Identify the correct decreasing order of bond dissociation enthalpy from following.

Identify the correct decreasing order of bond dissociation enthalpy from following.
  1. $\mathrm{F}-\mathrm{F}>\mathrm{Cl}-\mathrm{Cl}>\mathrm{Br}-\mathrm{Br}>\mathrm{I}-\mathrm{I}$
  2. $\mathrm{Cl}-\mathrm{Cl}>\mathrm{F}-\mathrm{F}>\mathrm{Br}-\mathrm{Br}>\mathrm{I}-\mathrm{I}$
  3. $\mathrm{I}-\mathrm{I}>\mathrm{Br}-\mathrm{Br}>\mathrm{Cl}-\mathrm{Cl}>\mathrm{F}-\mathrm{F}$
  4. $\mathrm{Cl}-\mathrm{Cl}>\mathrm{Br}-\mathrm{Br}>\mathrm{F}-\mathrm{F}>\mathrm{I}-\mathrm{I}$

Solution

:F - F: has small size and greater lone pair-lone pair repulsion therefore less B.S.

Asked in: MHT CET 2022 (06 Aug Shift 1)

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