Given below are two statements:
Assertion(A): All aldehydes do not take part in aldol condensation.
Reason(R): In aldol condensation, carbanion is generated by the abstraction of \(\alpha -H\) atom by base.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True and (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
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The major product of the following reaction is: 
1. 2.
3. 4.

 
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
From NCERT
NEET - 2025
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Consider the following sequence of reactions:
  
Identify \(\mathrm{A,B,}\) and \(\mathrm{C}\) in the reaction sequence:
1. \(\mathrm{A:DiBAL\text-H,}\) \(\mathrm{B:NaOH\text{ (dil)},}\) \(\mathrm{C:Zn\text-Hg/HCl}\)
2. \(\mathrm{A:LiAlH_4,}\) \(\mathrm{B:KOH\text{ (alcoholic)},}\) \(\mathrm{C:NH_2\text-NH_2/KOH}\)
3. \(\mathrm{A:DiBAL\text-H,}\) \(\mathrm{B:NaOH\text{ (dil)},}\) \(\mathrm{C:NH_2\text-NH_2/KOH}\)
4. \(\mathrm{A:NaBH_4,}\) \(\mathrm{B:KOH\text{ (aqueous)},}\) \(\mathrm{C:Zn\text-Hg/HCl}\)
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
From NCERT
JEE
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Which compound undergoes decarboxylation most readily under mild conditions?
1.  2. 
3.  4. 
Subtopic:  Name Reaction |
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The compound, among the following that cannot give a positive Tollen's test is:
1.  2. 
3.  4. 
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
From NCERT
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Consider the Cannizzaro reaction given below:

The slowest step in this reaction is:
1. attack of \(^-OH\) at the carbonyl group. 
2. transfer of hydride to the carbonyl group.
3. abstraction of a proton from the carboxylic acid.
4. deprotonation of \(PhCH_2OH.\)
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 50%
From NCERT
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An organic compound that neither reacts with neutral ferric chloride solution nor with Fehling's solution, but reacts with a Grignard reagent and gives a positive iodoform test, is:
​​​​
1.  2. 
3.  4. 
Subtopic:  Acid Derivatives - Preparation, Properties & Uses |
From NCERT
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Identify compound A that starts the following reaction sequence:
1. 2.
3. 4.
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
From NCERT
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In the following reaction sequence, predict the structure of the final product Y.
 
1. 2.
3. 4.
Subtopic:  Isomers & Reaction Mechanism | Carboxylic Acids: Preparation & Properties |
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In which one of the following cases will \(\alpha\)-hydrogen NOT be abstracted on treatment with one equivalent of base?
1. 2.
3. 4.
Subtopic:  Aldehydes & Ketones: Preparation & Properties | Carboxylic Acids: Preparation & Properties |
From NCERT
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