As far as I know, chromides exist only as binary compounds between chromium and other metals.
Chromates are more common, but I'm not sure if they exist as organic compounds.
The most probable are ethyl chloride C2H5Cl and ethyl bromide C2H5Br, also known as chloroethane and bromoethane. You need to do some research; chlorides and bromides are similar substances, so "chromide" sounds like a confusion between the two. Still, don't exclude ethyl chromate.