The reaction between propene and chlorine to give 1,2 - dichloropropene is a substitution reaction.

The correct option is B

False

During the formation of 1,2- Dichloropropane the double bond between carbon atoms is breaking and the chlorine atom is getting added on each carbon forming an alkane from an alkene.
The reaction is as follows:

Since the saturated compound is formed from an unsaturated compound the given reaction is an addition reaction and not a substitution reaction.