Boiling points
Chemistry
Level
2
What is the correct sequence of boiling points of hydrogen halides?
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HCl > HF > HBr > HI
HF > HCl > HBr > HI
HF > HCl > HI > HBr
HF > HI > HBr > HCl
HF > HBr > HI > HCl
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1 solution
In general boiling point increases with the molecule size. But fluorine is the most electronegative of all elements. It forms very strong hydrogen bond with hydrogen which greatly increases its boiling point, such that the boiling points of hydrogen halides follow H F > H I > H B r > H C l .