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Q.

Which one of the following hydrogen halides has the lowest boiling point? 

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a

HI

b

HCI

c

HF

d

 HBr

answer is B.

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Detailed Solution

.hydrogen chloride  to hydrogen iodide do not have hydrogen bonding hence will have lower boiling point than HF, from HCl to HI molecular weight increases therefore boiling point increases  HCl<HBr<HI<HF 

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