What is meant by Vinyl?

I mean we frequently hear about the term vinyl chloride.What is the meaning of it?

Do vinyl sulphate and other substances of vinyl exist?

Plz tell me the definition of vinyl as well.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane