Multiple choice

Which of the following matches of ‘property: trend’ for hydrogen halides is correct?

  1. Stability: HF < HCl < HBr < HI

  2. % Ionic character: HF < HCl < HBr < HI

  3. Dipole moment: HF < HCl < HBr < HI

  4. Reducing power: HF > HCl > HBr > HI

  5. Boiling point: HCl < HBr < HI < HF
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E Correct answer
Explanation

Correct order of boiling points of hydrogen halides is HCl < HBr < HI < HF. On moving down the group as the size increases van der Waals forces increases,  and hence boiling point increases. HF has highest boiling point due to presence of strong intermolecular H bonding.

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