Ethylidene chloride is a/an ..... .

1.  vic-dihalide
2.  gem-dihalide
3.  Allylic halide
4.  Vinylic halide

 In vic-dihalides, both halogen atoms are present on the adjacent saturated or unsaturated carbon atoms.

In gem-dihalides, both the halogen atoms are present on the same saturated or unsaturated carbon atom. They are known as alkylidene halides,

Allyl halides are the structure in which the halogen atoms are bonded to

sp3 saturated carbon atom adjacent to carbon carbon-double bond.