ANS: DC=O group is the functional group for ketoneIt is also called carbonyl groupOH is the functional group representing alcohol while CHO represents aldehyde

To clarify your answer regarding functional groups in organic chemistry, let's break down the concepts more thoroughly:

1. Functional Group for Ketones: The structure you mentioned, DC=O, refers to the presence of a carbonyl group (C=O) flanked by two carbon atoms, which is characteristic of ketones. Therefore, the carbonyl group serves as the functional group that defines a ketone. It is indeed a part of many organic compounds where it is bonded to two other carbon-containing groups (R groups).

2. Functional Group for Alcohols: The hydroxyl group (-OH) is the defining functional group for alcohols. This group is attached to a carbon atom and is responsible for the properties of alcohols, such as their ability to form hydrogen bonds, which generally results in higher boiling points compared to hydrocarbons.

3. Functional Group for Aldehydes: The structure CHO, which implies a carbonyl group (C=O) at the end of a carbon chain, is indicative of aldehydes. Unlike ketones, which contain the carbonyl group within the carbon chain, aldehydes contain it at the terminal position, which is key to their classification.

In conclusion, understanding these functional groups (carbonyl for ketones and aldehydes, and hydroxyl for alcohols) is essential in organic chemistry as they largely determine the chemical behavior and properties of these compounds.