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NEET Chemistry QUESTION #7397
Question 1
Which one of the following orders is NOT in accordance with the stated property?
  • \(\text{F}_2 > \text{Cl}_2 > \text{Br}_2 > \text{I}_2\): bond dissociation energy✔️
  • \(\text{F}_2 > \text{Cl}_2 > \text{Br}_2 > \text{I}_2\): oxidising power
  • \(\text{HI} > \text{HBr} > \text{HCl} > \text{HF}\): acidic property in water
  • \(\text{F} > \text{Cl} > \text{Br} > \text{I}\): electronegativity
Correct Answer Explanation
Bond dissociation energies of halogens:
\(\text{Cl}_2 > \text{Br}_2 > \text{F}_2 > \text{I}_2\)

F₂ has an anomalously low bond energy (158 kJ/mol) due to lone pair repulsion in the small F atom, making \(\text{Cl}_2\) stronger. So the order \(\text{F}_2 > \text{Cl}_2\) for bond dissociation energy is incorrect.

All other options are correct: oxidising power, acid strength of HX in water, and electronegativity all follow the stated orders.