Q. Which one of the following orders is not in accordance with the property stated against it?
A) F₂ > Cl₂ > Br₂ > I₂ : Oxidising power
B) HI > HBr > HCl > HF : Acidic property in water
C) F₂ > Cl₂ > Br₂ > I₂ : Electronegativity
D) F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy
Explanation
[Solution from source] Bond dissociation energy of the halogens is Cl₂ > Br₂ > F₂ > I₂, because the small F atoms' lone pairs repel and weaken the F–F bond. So the order F₂ > Cl₂ > Br₂ > I₂ for bond energy is incorrect, while it is correct for oxidising power and electronegativity, and HI > HBr > HCl > HF is the correct acid-strength order. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.