Which of the following are organic compounds?
CH3COOH
C2H5OH
C2H4
→ Organic compounds are any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen or nitrogen.
So, If we take look at the options,
CH3COOH → Contains carbon
C2H5OH → Contains carbon
HNO3 → Does not contain carbon
C2H4 → Contains carbon
Therefore, option (c) is incorrect. All others are correct.