I was stuck with this question and I can't solve it. I need some help to find the answer. A compound that consists of four different elements, one of which is a halogen.

Something like Bromochloromethane - Wikipedia, the free encyclopedia ?

I found it through Halocarbon - Wikipedia, the free encyclopedia, I'm sure you can find many more examples there.

There are thousands, such as the chloro anilines, various aromatic chlorosulfonic acids, etc.

You perhaps have to do different experiments to identify the elements present. May be either physical or chemical, such as salt analysis or something like that.