The IUPAC name of ethylidene chloride is :

Solution

Chemistry ma’am · 3 steps

Ethylidene means CH₃CH<: both chlorines sit on the same carbon, so the locants are 1,1.

1. Read the common name. Ethylidene is the group CH₃-CH<, a two-carbon unit whose two free bonds are on the same carbon. Ethylidene chloride puts two Cl atoms on those two bonds: CH₃-CHCl₂.
2. Name the chain. The chain has two carbons joined by single bonds only, so the parent is ethane. Number from the end that gives the chlorines the lowest locants, which places both of them on C-1.

   CH₃-CHCl₂ ⇒ 1,1-Dichloroethane

3. So. The IUPAC name of ethylidene chloride is 1,1-dichloroethane, option (d).

The idea to keep. In common names, "-idene" means two bonds on one carbon (a geminal dihalide, 1,1-). "Ethylene" dichloride has one halogen on each carbon (a vicinal dihalide, 1,2-).

Answer from the NTA final answer key. Solution by PrepWiser.