R-C=O represents which functional group?

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Study for the IMAT Chemistry Exam. Access flashcards and multiple choice questions; hints and explanations included for each question. Prepare effectively for your exam.

Multiple Choice

R-C=O represents which functional group?

Explanation:
R-C=O is showing a carbonyl group, a carbon atom double-bonded to oxygen. What the carbonyl carbon is attached to on the other side determines the specific name. If the carbonyl carbon is bonded to two carbon-containing groups, you have a ketone. If it were bonded to a hydrogen as well, that would be an aldehyde. Carboxylic acids involve a carbonyl plus an O–H group, and alcohols lack the carbonyl entirely. Since the fragment implies the carbonyl carbon is connected to carbon on the other side rather than to hydrogen, the structure fits a ketone.

R-C=O is showing a carbonyl group, a carbon atom double-bonded to oxygen. What the carbonyl carbon is attached to on the other side determines the specific name. If the carbonyl carbon is bonded to two carbon-containing groups, you have a ketone. If it were bonded to a hydrogen as well, that would be an aldehyde. Carboxylic acids involve a carbonyl plus an O–H group, and alcohols lack the carbonyl entirely. Since the fragment implies the carbonyl carbon is connected to carbon on the other side rather than to hydrogen, the structure fits a ketone.

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