First slide

Electronic configuration and Atomic , physical properties

Question

Which of the following is incorrect with respect to property indicated ?

Easy

A

Electro Negativity: F > Cl > Br
B

Electron Affinity: Cl > Br < F
C

Oxidising power: F₂ > Cl₂ > Br₂
D

Bond energy: F₂ > Cl₂ > Br₂

Solution

Bond lengths of halogens are in the order : F₂ < Cl₂ < Br₂
Bond energies are expected in the order : F₂ > Cl₂ > Br₂
But the experimental bond enthalpies are :Cl₂ > Br₂ > F₂, 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.

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