When organic compounds contain more than one functional group, it is known as:

Explanation

1. **Functional Groups:** In organic chemistry, a functional group is a specific group of atoms or bonds within a molecule that gives the compound its characteristic chemical properties. Examples include hydroxyl (-OH), carbonyl (C=O), amino (-NH2), etc. 2. **Polyfunctional Compounds:** When a molecule contains more than one type of functional group, it is termed polyfunctional. These compounds exhibit a combination of chemical reactivities associated with each functional group present. 3. **Versatility and Reactivity:** Polyfunctional compounds are often more versatile and reactive due to the diverse chemical properties of their functional groups. This can lead to a wide range of possible reactions and applications in organic synthesis. 4. **Polyfunctional Isomers:** The concept of polyfunctional compounds is related to isomerism. Isomers are compounds with the same molecular formula but different structural arrangements. In the case of polyfunctional compounds, isomerism arises from different arrangements or combinations of functional groups. 5. **Example:** Consider a molecule with both an alcohol (-OH) and an amine (-NH2) group. This compound would be polyfunctional as it contains two different functional groups. Depending on their relative positions within the molecule, different isomeric forms could exist. In summary, "polyfunctional" is a term used to describe organic compounds that possess more than one type of functional group, providing them with diverse chemical reactivity and potential applications in various chemical processes. Therefore option C is correct.