Dichloroethane is produced when chlorine reacts with chloroethane in a light-catalyzed substitution reaction. Write names for two dichloroethane isomers.

• A. 2,1-dichloroethane and 2,2-dichloroethane
• B. 1,1-dichloroethane and 2,2-dichloroethane
• C. 1-dichloroethane and 2-dichloroethane
• D. 1,1-dichloroethane and 1,2-dichloroethane

Answer: (D)