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Q. No.
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%
Level 3: 35%-60%
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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 |
Level 3: 35%-60%
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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 |
Level 3: 35%-60%
JEE
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Consider the given statements:

Statement I: The conversion of but-2-ene to ethanal can be obtained by reductive ozonolysis. 
Statement II: The conversion of allyl alcohol to propenal is a reduction reaction and can be achieved using the PCC reagent.
 
1. Statement I is correct; Statement II is correct.
2. Statement I is correct; Statement II is incorrect.
3. Statement I is incorrect; Statement II is correct.
4. Statement I is incorrect; Statement II is incorrect.
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
The final product 'A' in the following reaction sequence is-
    
1.
2.
3.
4.

 
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
JEE
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The major product of the following reaction is: 
1. 2.
3. 4.

 
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
NEET - 2025
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Identify compound A that starts the following reaction sequence:
1. 2.
3. 4.
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
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Above compounds can be differentiated by following reagent:

1. 2-4 DNP (Brady reagent)

2. Tollen's reagent

3. Bromine water reagent

4. NaHSO3

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
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NEET 2026 - Target Batch - Vital
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Which, of the following compounds, can give iodoform reaction? 
1. \(~~~~~~~~~~~~O\\ ~~~~~~~~~~~~||\\ HO-C-CH_3\)
2. \(~~~~~~~~~~~~~O\\ ~~~~~~~~~~~~~~||\\ H_2N-C-CH_3\)
3. \(~~~~~~~~~~~~~O\\ ~~~~~~~~~~~~~||\\ CH_3 -C - CH_3\)
4. All of the above
 
Subtopic:  Aldehydes & Ketones: Preparation & Properties |
Level 3: 35%-60%
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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 |
Level 4: Below 35%
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