The variation of the boiling points of the hydrogen halides is in the order $H F > H I > H B r > H C l$
What explains the higher boiling point of hydrogen fluoride?

There is strong hydrogen bonding between HF molecules.

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

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

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

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Solution

The correct option is A There is strong hydrogen bonding between HF molecules.
HF forms strong intermolecular H- Bonding due to high electronegativity of F . Hence, the boiling point of HF is abnormally high. Boiling points of other hydrogen halides gradually increase from HCI to HI due to increase in size of halogen atoms from CI to I which further increase the magnitude of van der waals forces.

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Similar questions

Q. The variation of the boiling points of the hydrogen halides is in the order

H F > H I > H B r > H C l

. What explains the higher boiling point of hydrogen fluoride?

$A s s e r t i o n - --------- -$ (A): The boiling point of HF is higher than that of $H_{2} O$
$R e a s o n - ------- -$ (R): The hydrogen bond strength in HF is lower than that in $H_{2} O$

Q. Assertion :Boiling point of

H F

is lesser than water. Reason: Hydrogen bonding in water is weaker than

H F

Question 04

Hydrogen bonds are formed in many compounds e.g., $H_{2} O, H F, N H_{3}$ . The boiling point of such compounds depends to a extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points above compounds is

(a) $H F > H_{2} O > N H_{3}$

(b) $H_{2} O > H F > N H_{3}$

(d) $N H_{3} > H_{2} O > H F$

Q. The bond between hydrogen and fluorine in a molecule of hydrogen fluoride.

H F

is sometimes considered an ionic bond and other times is considered a covalent bond.
What is the reason for this confusion?

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

The variation of the boiling points of the hydrogen halides is in the order $H F > H I > H B r > H C l$
What explains the higher boiling point of hydrogen fluoride?