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Organic Chemistry

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Aldehydes and Ketones

Question
5 out of 16
 

Which of the following carbons indicated by arrows has the most acidic protons?

image\28038 ch 22 Q 5.png



A a
B b
C c
D No acidic protons are present, since ketones cannot be acidic
Ans. B The carbonyl group can act as an electron-withdrawing group. This greatly increases the acidity of a carbonyl compound. Proximity to the carbonyl group is of very great influence in the case of acidity. In essence, carbonyl groups increase the acidity of protons that are connected to the adjacent carbon atoms. The closest protons influenced by the carbonyl group are indicated by the arrows a and b. Among these positions, the protons indicated by b are more acidic because they are influenced by the carbonyl groups from both sides.

Aldehydes and Ketones Flashcard List

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