Write structures of different dihalogen derivatives of propane.

Explanation

Four isomeric dihalogen derivatives of propane are formed. For example,
`underset("1,3-Dibromopropane")(BrCH_(2)CH_(2)CH_(2)Br)` `underset("1,2-Dibromopropane")(BrCH_(2)-underset(Br)underset(|)CH-CH_(3))` `underset("1,1-Dibromopropane")(Br-underset(Br)underset(|)CH-CH_(2)-CH_(3))` `underset("2,2-Dibromopropane")(CH_(3)-underset(Br)underset(|)overset(Br)overset(|)C-CH_(3))`
Similarly, we may write four dihalogen derivatives of other halogens.