CH3COOH is the molecular formula for acetic acid, the main component of vinegar. It consists of a methyl group (CH3) bonded to a carboxyl group (COOH). Vinyl Acetate is C4H6O2, Chloroform is CHCl3, and 'Methanic Acid' is not a standard chemical name (formic acid is HCOOH, also called methanoic acid).