Aldehydes, Ketones And Carboxylic Acids

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1

Self-aldol condensation reactions

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1. Aldehydes and ketones having at least one -hydrogen can undergo Aldol condensation reaction.
2. In the presence of dilute alkali as catalyst, aldehydes and ketones form -hydroxy aldehydes (aldol) or -hydroxyketones (ketol) as product.
3. When aldol condensation is carried out using same aldehyde or ketone, it is called Self-aldol condensation.
Aldol condensation product of acetone on dehydration gives
A
but-2-enal
B
2-methyl-pent-3-en-4-one
C
4-hydroxy-4-methylpentan-2-one
D
4-methyl-pent-3-en-2-one
2

Effect of electron-withdrawing substituents on the acidic strength

Electron withdrawing groups increase the acidity of the carboxylic acid group by decreasing the negative charge density on the carboxylate ion through inductive or resonance effects, thus stabilizing it.
Which of the following represents the correct order of the acidity in the given compound?
A
B
C
D
3

Cross-aldol condensation reactions

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1. When aldol condensation is carried out between two different aldehydes and/or ketones, it is called Cross aldol condensation.
2. If both of the molecules contain -hydrogen atoms, a mixture of four products is obtained.
Following reaction is known as:
A
Perkin reaction
B
Benzoin condensation
C
Cross aldol condensation
D
Claisen condensation
The product formed by aldol condensation between benzaldehyde and acetone is benzalacetone. Its structure is:
A
B
C
D