Boiling points of the hydrogen halides...

Boiling points of the hydrogen halides

Increase regularly in order of relative molecular mass

Decrease sharply from HF to HCl and then increases

Decrease regularly in order of relative molecular mass

Increase sharply from HF to HCI and then decrease regularly with increase of relative molecular mass.

Text Solution

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The correct Answer is:

The increasing order of boiling point is HCl lt HBrlt HI lt HF
Boiling point increases with increase in atomic weight of halogen due to increase in the van der Waals forces. However, boiling point of HF is highest due to presence of hydrogen bonding.

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The variation of the boiling point of the hydrogen halides is in the order HFgtHIgtHHHHHBrgtHCI

the bond energy of `HF` molecules is greater than in other hydrogen halides

the effect of nuclear shielding is much reduced in flurorine which polarisses the `HF`molecules

The electronegativity of fluorine is much higher than for other element in the group

There is strong hydrogen bonding between `HF` molecules

The correct order of boiling points of hydrogen halide is:

`HF gt HCI gt HBr gt HI`

`HI gt HBr gt HCI gt HF`

`HCI gt HF gt HI gt HBr`

`HF gt HI gt HBr gt HCI`

The variation of boiling points of hydrogen halides is in tha order HF gt HI gt HBr gt HCl . What explains the higher boiling point of hydrogen fluoride ?

There is strong hydrogen bonding between HF molecules

The bond energy of HF molecules is greater
than in other hydrogen halides

The effect of nuclear shielding is much reduced
in fluorine which polarises the HF molecule

The electronegativity of flurine is much
higher than for other elements in the group .