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COMEDK20269 May 2026Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Which among the following is NOT in accordance with the property stated against it?

Options

  1. AF₂ > Cl₂ > Br₂ > I₂ [Oxidising Power]
  2. BHI > HBr > HCl > HF [Acidic Property in Water]
  3. CF₂ > Cl₂ > Br₂ > I₂ [Electronegativity]
  4. DF₂ > Cl₂ > Br₂ > I₂ [Bond Dissociation Energy]

Correct answer

D. F₂ > Cl₂ > Br₂ > I₂ [Bond Dissociation Energy]

Step-by-step solution

The oxidising power of halogens decreases down the group: F₂ > Cl₂ > Br₂ > I₂ . The acidic strength of hydrogen halides in water increases down the group due to a decrease in bond dissociation enthalpy: HI > HBr > HCl > HF . Electronegativity decreases down the group: F > Cl > Br > I . The bond dissociation energy of halogens does not follow a regular trend. Due to strong interelectronic repulsions between the lone pairs on the small fluorine atoms, the F-F bond is weaker than the Cl-Cl and Br-Br bonds. The correct

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