Write structures of different dihalogen derivatives of propane.

Explanation

Four isomeric dihalogen derivatives of propane are:
`underset(1,2-"dihalopropane")(underset(X)overset(1)(C)H_(2)-overset(2)underset(X)(C)H-overset(3)underset(X)(C)H_(3))` `underset(1,3-"dihalopropane")(underset(X)overset(1)(C)H_(2)-overset(2)(C)H-overset(3)underset(X)(C)H_(3))`
`underset(1,1-"dihalopropane")(overset(3)(C)H_(3)-overset(2)(C)H_(2)-overset(1)underset(X)(C)H-X)`