Explain classification of haloalkanes and haloarenes on the basis of number of halogen atoms.

Explanation

Depending upon the number of hydrogen atoms(s) replaced by the halogen atoms(s) these are classified as mono, di, or polyhalogens (tri - , tetra-, etc.)
For example

The monohalogen derivatives of alkane are known as Alkyl Halides or Haloalkanes.They have general formula.
A - X, X = F, Cl, Br, I, = Alkyl group.