Discussion
The molecule which has the highest percentage of ionic character among the following is
Answer: B
HF has the greatest ionic character.
By Fajans' rules and Pauling's relation, ionic character rises with the electronegativity difference between the atoms. That difference is \(4.0-2.1=1.9\) for H–F, against 0.9 for H–Cl, 0.7 for H–Br and 0.4 for H–I. HF is about 43 per cent ionic, which also explains its hydrogen bonding and unusually high boiling point.
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