NEET2015Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual
The variation of the boiling points of the hydrogen halides is in the order H F > H I > H B r > H C l . Which of the following option explains the higher boiling point of hydrogen fluoride?
Options
- AThe electronegativity of fluorine is much higher than for other elements in the group.
- BThere is strong hydrogen bonding between HF molecules.
- CThe bond energy of HF molecules is greater than in other hydrogen halides.
- DThe effect of nuclear shielding is much reduced in fluorine which polarizes the HF molecule.
Correct answer
B. There is strong hydrogen bonding between HF molecules.
Step-by-step solution
Due to strong H-bonding in HF molecule, boiling point is highest for HF . H F > H I > H B r > H C l