Q

# Help me answer: - p- Block Elements - NEET

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

• Option 1)

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

• Option 2)

There is strong hydrogen bonding between HF molecules

• Option 3)

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

• Option 4)

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

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As learnt in

Boiling point of Hydride -

HF>HI>HBr>HCl

- wherein

Boiling point of HF is due to H-Bond

Order of boiling point : HF > HI > HBr > HCl

HF has highest boiling point because of strong hydrogen bonding.

Option 1)

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

This option is incorrect

Option 2)

There is strong hydrogen bonding between HF molecules

This option is correct

Option 3)

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

This option is incorrect

Option 4)

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

This option is incorrect

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