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?

The bond energy of

H F

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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There is strong hydrogen bonding between

H F

molecules

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Solution

The correct option is C There is strong hydrogen bonding between $H F$ molecules
The higher boiling point of hydrogen fluoride is due to the presence of strong hydrogen bonding between HF molecules which leads to the association of HF molecules and requires higher energy for boiling.

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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

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?

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

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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 correct option is C There is strong hydrogen bonding between HF moleculesThe higher boiling point of hydrogen fluoride is due to the presence of strong hydrogen bonding between HF molecules which leads to the association of HF molecules and requires higher energy for boiling.

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?

The correct option is C There is strong hydrogen bonding between $H F$ molecules
The higher boiling point of hydrogen fluoride is due to the presence of strong hydrogen bonding between HF molecules which leads to the association of HF molecules and requires higher energy for boiling.