Which of the following is an example of vic-dihalide?

1.  Dichloromethane
2.  1, 2-dichloroethane

3.  Ethylidene chloride
4.  Allyl chloride

vic-dihalides are dihalides where 2 halogen atoms are lying on the two adjacent carbon atoms.

The structures of above given compounds are as follows:



In 1, 2-dichloroethane, there is a presence of two chlorine atoms on two adjacent carbon
atoms of carbon chain.

Hence, option (b) is correct.