Question

The boiling point of haloalkanes are higher than the parent hydrocarbon of comparable molecular mass because

• A. Addition of the halogen introduces polarity in the molecule
• B. Increase in the Vander-Waals forces of attraction
• C. Increase in the molecular mass due to the presence of halogen
• D. all of the above

Answer 1

The correct option is D all of the above

Intermolecular forces of attractions increases as​ molecular size and molecular mass increases.​ So, large amount​ of heat require to break strong intermolecular forces​ and thus boiling point increases.
As polarity of C-X bond increases, intermolecular force of attraction increases.​
polarity order : $C-F>C-Cl>C-Br>C-I$
Due to strong intermolecular force of attraction (dipole–dipole and van der Waals forces)​, large amount​ of heat is required to break strong intermolecular forces, so boiling point increases.