Question

The boiling points of different alkyl halides having same alkyl group decrease in the order

Options

• R – Cl > R – I > R – F > R – Br

• R – Br > R – Cl > R – I > R – F

• R – F > R – Cl > R – Br > R – I

• R – I > R – Br > R – Cl > R – F

Answer 1

R – I > R – Br > R – Cl > R – F

Explanation:

Because the magnitude of van der Waals force increases with an increase in size and mass of halogen, the boiling point of alkyl halides with the same alkyl group increases with the increasing atomic mass of halogen.

∴ R – I > R – Br > R – Cl > R – F