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What functional group is present in all alcohols?

Carbonyl group

Amino group

Hydroxyl group

In all alcohols, the functional group that is consistently present is the hydroxyl group. The hydroxyl group, which consists of an oxygen atom bonded to a hydrogen atom (–OH), is what characterizes alcohols and is responsible for their properties. This functional group allows alcohols to engage in hydrogen bonding, which influences their boiling points, solubility in water, and other chemical behaviors. Each alcohol is essentially a hydrocarbon chain or ring with this hydroxyl group attached, distinguishing them from other types of compounds.

The other functional groups mentioned, such as carbonyl groups, amino groups, and ester groups, serve to define entirely different classes of compounds and do not appear in all alcohols. For instance, carbonyl groups are found in aldehydes and ketones, amino groups are characteristic of amines, and ester groups are indicative of esters. Therefore, the hydroxyl group is the sole functional group specific to alcohols.

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Ester group

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