Question

Which of the following reactions is not shown by ketones?
A. Reaction with HCN
B. Reaction with fehling solution
C. Reaction with NaHSO3
D. Reaction with 2,4 dinitrophenyl hydrazine

Right answer is B.

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Answer 1

Answer:

Right answer is option B.

Explanation:

Hope it helps you !

Answer 2

Ketones don't react with Fehling's solution, Option B is the correct answer.

1. Reaction with HCN:

• Ketones when added with HCN give Hydoxynitriles. HCN will be added with the Carbon-Oxygen double bond to produce Hydroxynitriles.

Hence, this property is shown by ketones.

2. Reaction with Fehling solution:

• Fehling's solution is a mixture of Rochelle's salt(blue color) and copper sulfate(CuSO4).
• It is an oxidizing agent which is used to differentiate between aldehydes and ketones.
• Ketones generally do not react with Fehling's solution.
• A Red color precipitate is formed when Fehling's solution is reacted with Aldehydes.

Hence, This property is not shown by ketones.

3. Reaction with NaHSO3:

• Ketones generally get added with NaHSO3 by the process of Nucleophilic addition.
• There are no exceptions i.e, all ketones will react with NaHSO3.

Hence, This property is shown by Ketones.

4. Reaction with 2,4 dinitrophenyl hydrazine:

• Aldehydes and Ketones on reaction with 2,4 dinitrophenyl hydrazine generally form orange/yellow precipitates.
• This test is a good experiment to differentiate between Alcohols and Ketones OR Alcohols and Aldehydes.

Hence, This property is shown by Ketones.