First slide

Electronic configuration and Atomic , physical properties

Question

( I ) The bond dissociation energy of Fluorine is less than Bromine.
( II) In Fluorine molecule, lone pair-lone pair electronic repulsions and appreciable due to small size of Fluorine.

Easy

A

I and II are true
B

I is true II is false
C

I is false and II is true
D

I and II are false

Solution

Bond lengths of halogens are in the order : F₂ < Cl₂< Br₂ < I₂.
Bond energies are expected in the order : F₂ > Cl₂ > Br₂ > Cl₂.
But the experimental bond enthalpies are : Cl₂ > Br₂ > F₂ > I₂.
Bond enthalpy of F₂ is very less, because lone pair - lone pair repulsions are appreciable in F₂ as the bond length is small in F₂.
It was also thought, though not appropriate, that F–F bond is weak as multiple bond is not possible with no d-orbitals in the valence shell of fluorine.

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