Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

2. I, Br, Cl, F

Explanation:
The bond between carbon and the halogen atom (C-X) is polar. Since halogen atoms are more electronegative than carbon, there is partial negative charge on halogen atom and positive charge on carbon.
This makes the molecule dipolar and polar nature of C-X bond is increase with increase in the electronegativity difference between carbon and halogen atom.
Hence the order of polarity of C−X bond is C−F>C−Cl>C−Br>>C−I.