Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol condensation D. Pollen's Test E. Clemmensen Reduction Choose the correct answer from the options given below:

Let us check each option pathway: - **A. Iodoform Reaction:** Positive for both because both contain the CH3-C=O methyl ketone fragment. - **B. Cannizaro Reaction:** Negative for both because both contain alpha-hydrogens. - **C. Aldol Condensation:** Positive for both because they have alpha-hydrogens available for enolization. - **D. Pollen's Test (Tollen's Test):** Positive only for acetaldehyde (aldehyde); negative for acetone (ketone). - **E. Clemmensen Reduction:** Positive for both as they contain reducible carbonyl groups. Thus, both react via A, C, and E. Sees: Functional comparison of Acetaldehyde and Acetone. Shortcut: Ketones do not respond to Tollen's test, which instantly eliminates choices featuring statement D. Class 12 Chemistry: Aldehydes, Ketones and Carboxylic Acids

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol condensation D. Pollen's Test E. Clemmensen Reduction Choose

Let us check each option pathway: - **A. Iodoform Reaction:** Positive for both because both contain the CH3-C=O methyl ketone fragment. - **B. Cannizaro Reaction:** Negative for both because both contain alpha-hydrogens. - **C. Aldol Condensation:** Positive for both because they have alpha-hydrogens available for enolization. - **D. Pollen's Test (Tollen's Test):** Positive only for acetaldehyde (aldehyde); negative for acetone (ketone). - **E. Clemmensen Reduction:** Positive for both as they

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol condensation D. Pollen's Test E. Clemmensen Reduction Choose the correct answer from the options given below:

Let us check each option pathway: - **A. Iodoform Reaction:** Positive for both because both contain the CH3-C=O methyl ketone fragment. - **B. Cannizaro Reaction:** Negative for both because both contain alpha-hydrogens. - **C. Aldol Condensation:** Positive for both because they have alpha-hydrogens available for enolization. - **D. Pollen's Test (Tollen's Test):** Positive only for acetaldehyde (aldehyde); negative for acetone (ketone). - **E. Clemmensen Reduction:** Positive for both as they contain reducible carbonyl groups. Thus, both react via A, C, and E. Sees: Functional comparison of Acetaldehyde and Acetone. Shortcut: Ketones do not respond to Tollen's test, which instantly eliminates choices featuring statement D. Class 12 Chemistry: Aldehydes, Ketones and Carboxylic Acids

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol condensation D. Pollen's Test E. Clemmensen Reduction Choose

Let us check each option pathway: - **A. Iodoform Reaction:** Positive for both because both contain the CH3-C=O methyl ketone fragment. - **B. Cannizaro Reaction:** Negative for both because both contain alpha-hydrogens. - **C. Aldol Condensation:** Positive for both because they have alpha-hydrogens available for enolization. - **D. Pollen's Test (Tollen's Test):** Positive only for acetaldehyde (aldehyde); negative for acetone (ketone). - **E. Clemmensen Reduction:** Positive for both as they

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B…

Year	2026	2025	2024	Total
Questions	14	21	11	46

Year

2026

2025

2024

Total

Questions

Solution & Explanation

Core Logic

Let us check each option pathway:

A. Iodoform Reaction: Positive for both because both contain the $CH₃-C=O$ $\mathrm{CH}_3-\mathrm{C}=\mathrm{O}$ methyl ketone fragment.
B. Cannizaro Reaction: Negative for both because both contain $α$ $\alpha$-hydrogens.
C. Aldol Condensation: Positive for both because they have $α$ $\alpha$-hydrogens available for enolization.
D. Pollen's Test (Tollen's Test): Positive only for acetaldehyde (aldehyde); negative for acetone (ketone).
E. Clemmensen Reduction: Positive for both as they contain reducible carbonyl groups.

Thus, both react via A, C, and E.

Pattern Recognition

Sees: Functional comparison of Acetaldehyde and Acetone. Shortcut: Ketones do not respond to Tollen's test, which instantly eliminates choices featuring statement D.

Chapter Mix

Class 12 Chemistry: Aldehydes, Ketones and Carboxylic Acids

More Aldehydes, Ketones and Carboxylic Acids Previous-Year Questions — Page 10

Q jee_main_2024_31_jan_morning Reactions with Grignard Reagent

The product of the following reaction is P.

Reactions with Grignard Reagent diagram for Q84 - JEE Main 2024 Morning — The image shows p-hydroxybenzaldehyde reacting with one equivalent of PhMgBr followed by aqueous ammonium chloride.

The number of hydroxyl groups present in the product P is

Numerical Answer. Answer: 0 to 0

Solution

Core Logic

The given reactant is p-hydroxybenzaldehyde, which contains both a phenolic $-OH$ $-OH$ group (acidic) and an aldehyde group (electrophilic).

When one equivalent of Grignard reagent ( $PhMgBr$ $PhMgBr$) is added, it behaves primarily as a strong base due to the presence of an acidic proton. Acid-base reactions are extremely fast compared to nucleophilic additions.

The acidic phenolic $-OH$ $-OH$ reacts with $PhMgBr$ $PhMgBr$:

PhMgBr + HO-C₆H₄-CHO arrow Ph-H (Benzene) + BrMg-O-C₆H₄-CHO

Upon workup with $aq. NH₄Cl$ $aq. NH_4Cl$, the phenoxide ion simply regenerates the starting p-hydroxybenzaldehyde. However, the question asks for the number of hydroxyl groups present in the formed product (Benzene).

The distinct product formed in the reaction is Benzene. Benzene has 0 hydroxyl groups.

Pattern Recognition

Whenever a Grignard reagent encounters a molecule with an acidic hydrogen (alcohol, phenol, amine, alkyne), it will invariably act as a base first. If only 1 equivalent is used, nucleophilic addition to carbonyls will NOT happen.

Chapter Mix

Class 12 Chemistry: Aldehydes, Ketones and Carboxylic Acids Class 12 Chemistry: Alcohols, Phenols and Ethers

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol condensation D. Pollen's Test E. Clemmensen Reduction Choose the correct answer from the options given below:

Solution & Explanation

Core Logic

Pattern Recognition

Chapter Mix

Reference Study Guides

More Aldehydes, Ketones and Carboxylic Acids Previous-Year Questions — Page 10

Solution

Core Logic

Pattern Recognition

Chapter Mix

More Aldehydes, Ketones and Carboxylic Acids Questions — jee_main_2025_28_jan_morning

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Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol condensation D. Pollen's Test E. Clemmensen Reduction Choose the correct answer from the options given below:

Solution & Explanation

Core Logic

Pattern Recognition

Chapter Mix

Reference Study Guides

More Aldehydes, Ketones and Carboxylic Acids Previous-Year Questions — Page 10

Solution

Core Logic

Pattern Recognition

Chapter Mix

More Aldehydes, Ketones and Carboxylic Acids Questions — jee_main_2025_28_jan_morning

Select Your Target Exam

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