What type of bond is present in a ketone?

A ketone is characterized by the presence of a carbonyl functional group, which consists of a carbon atom double-bonded to an oxygen atom (C=O). This carbonyl bond is the defining feature of ketones, and it plays a critical role in their chemical behavior and properties. Ketones have the general formula R2C=O, where R represents hydrocarbon groups or atoms attached to the carbon atom of the carbonyl group.

Understanding the carbonyl bond is important for recognizing the reactivity of ketones in various organic reactions, such as nucleophilic addition and condensation reactions. The other types of bonds listed do not pertain to the structure of ketones; therefore, they are irrelevant in this context. The hydroxyl bond is characteristic of alcohols, the amino bond pertains to amines, and the ester bond is found in esters, which are formed from the reaction of an alcohol with a carboxylic acid.