Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Bond enthalpy is inversely proportional to the bond length. The bond length order of $\mathrm{C}-\mathrm{X}$ bond in methyl halides depends on the size of the halogen atom. Bond length order: ${\mathrm{CH}}_3-\mathrm{F}<{\mathrm{CH}}_3-\mathrm{Cl}<{\mathrm{CH}}_3-\mathrm{Br}<{\mathrm{CH}}_3-\mathrm{I}$

Hence, bond enthalpy order is

${\mathrm{CH}}_3-\mathrm{F}>{\mathrm{CH}}_3-\mathrm{Cl}>{\mathrm{CH}}_3-\mathrm{Br}>{\mathrm{CH}}_3-\mathrm{I}$