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Q.

Correct order of boiling points of hydrogen halides is

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a

HF > HCl > HBr > HI

b

HF < HBr < HI < HCl

c

HCl < HBr < HI < HF

d

HF < HCl < HBr < HI

answer is C.

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Detailed Solution

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The boiling points of hydrogen halides generally increase with increasing atomic/molecular size and increasing intermolecular forces. 

The correct order of boiling points of hydrogen halides is: HCl < HBr < HI <HF

HF has the highest boiling point due to the strong hydrogen bonding between HF molecules. The H-F bond is highly polar, and as a result, hydrogen bonding is particularly strong between HF molecules.

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Correct order of boiling points of hydrogen halides is