Chemistry Fundamental Principles of Organic Chemistry MDCAT 2014
PMDC Verified Question 80 of 83
Which one of the following is a ketone?
A
\( \text{CH}_3\text{--O--CH}_2\text{--CH}_3 \)
B
\( \text{CH}_3\text{COCOOH} \)
C
\( \text{CH}_3\text{--CO--CH}_2\text{--CH}_3 \)
D
\( \text{CH}_3\text{--CH}_2\text{CHO} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: \( \text{CH}_3\text{--CO--CH}_2\text{--CH}_3 \)
Concept:

A ketone is an organic compound that contains a carbonyl group (\( \text{C}=\text{O} \)) bonded to two alkyl or aryl carbon groups (\( \text{R--CO--R'} \)).

Solution:

  • Let's analyze the options:


  • A: Contains an oxygen between two alkyl groups (\( \text{R--O--R'} \)), so it is an ether.


  • B: Contains a carboxylic acid group (\( \text{-COOH} \)).


  • C: Contains a carbonyl carbon flanked by a methyl group and an ethyl group. This fits the \( \text{R--CO--R'} \) formula, so it is a ketone (2-butanone).


  • D: Contains a formyl group (\( \text{-CHO} \)), making it an aldehyde.


Why other options are incorrect:

They represent different functional classes: ether (A), carboxylic acid derivative (B), and aldehyde (D).

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