The bond dissociation energy is highest for — JEE Main 2023 Chemistry PYQ

JEE Main 2023 · 29 Jan · Shift 1

The bond dissociation energy is highest for

A.
$\text{Br}_2$
B.
$\text{F}_2$
C.
$\text{I}_2$
D.
$\text{Cl}_2$

Show answer and solution

Correct option: D

Solution

Cl₂ has the highest bond dissociation energy among the halogens because its atomic size allows effective p-p orbital overlap without significant lone-pair repulsion. F₂, despite being smaller, has anomalously low bond energy (~159 kJ/mol) due to strong lone-pair–lone-pair repulsions between the very closely spaced, electron-dense F atoms. Cl₂ (~243 kJ/mol) > Br₂ (~193 kJ/mol) > I₂ (~151 kJ/mol) > F₂, making Cl₂ the correct answer.

[JEE Main 2023 · 29 Jan · Shift 1]

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JEE Main 2023 Chemistry question on Chemical Bonding