Which option describes an ester functional group?

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Multiple Choice

Which option describes an ester functional group?

Explanation:
An ester has a carbonyl carbon double-bonded to oxygen and single-bonded to an alkoxy group (-O-R). That gives the C=O together with an O-R attachment, often shown as COO-R. So describing C=O plus O-R captures the ester structure precisely. A carboxylic acid would instead have C=O with an OH group, not O-R; an OH group by itself is just a hydroxyl, and a nitrogen-containing group is not an ester.

An ester has a carbonyl carbon double-bonded to oxygen and single-bonded to an alkoxy group (-O-R). That gives the C=O together with an O-R attachment, often shown as COO-R. So describing C=O plus O-R captures the ester structure precisely. A carboxylic acid would instead have C=O with an OH group, not O-R; an OH group by itself is just a hydroxyl, and a nitrogen-containing group is not an ester.

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