Chemistry Aldehydes & Ketones NUMS 2022
PMDC Verified Question 44 of 94
The identification test for Ketone is:
A
Benedict's Solution Test
B
Fehling's Solution Test
C
Sodium Nitroprusside Test
D
Tollen's Test
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Sodium Nitroprusside Test
Concept:

Chemical tests differentiate functional groups based on unique color changes resulting from specific reactions.

Solution:

  • The Sodium Nitroprusside test is used specifically to detect ketones (particularly methyl ketones).


  • When an alkaline solution of sodium nitroprusside is added to a ketone, the enolate anion of the ketone forms a complex with the nitroprusside ion.


  • This produces a characteristic intense red or purple coloration. Aldehydes do not give this specific color change.


Why other options are incorrect:

Options A, B, and D are all mild oxidation tests specifically designed to yield positive results for aldehydes, while ketones give negative results.

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