Which of the following organic functional groups contains a carbonyl group bonded directly to both a carbon atom and a hydroxyl group?
Answer and explanation
Correct answer: B. Carboxylic acid
- Step 1: Examine the structural definition: A carbonyl group is C=O.
- Step 2: When C=O is attached to an -OH group and a carbon skeleton (-R), the structure is -C(=O)OH.
- Step 3: Identify the family: This defines a carboxylic acid.
Answer
Carboxylic acid.
Why not the others: 'Ester' has a carbonyl bonded to an alkoxy group (-OR); 'Aldehyde' has a carbonyl bonded to hydrogen and carbon (-CHO); 'Ketone' has a carbonyl bonded between two carbon atoms (-RC(=O)R').
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