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Which undergoes aldol condensation in th...

Which undergoes aldol condensation in the presence of dilute NaOH?

A

Salicylaldehyde

B

Benzophenone

C

Benzaldehyde

D

Acetaldehyde and formaldehyde mixture.

Text Solution

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The correct Answer is:
To determine which compounds undergo aldol condensation in the presence of dilute NaOH, we can follow these steps: ### Step 1: Understand Aldol Condensation Aldol condensation is a reaction that occurs between two aldehydes or ketones that have at least one alpha-hydrogen. In the presence of a base like NaOH, one of the carbonyl compounds forms an enolate ion, which then attacks the carbonyl carbon of another molecule, leading to the formation of a β-hydroxy aldehyde or ketone. ### Step 2: Identify the Compounds Let's assume we have two aldehydes: acetaldehyde (CH3CHO) and formaldehyde (HCHO). We need to check if these compounds can undergo aldol condensation. ### Step 3: Check for Alpha-Hydrogens - **Acetaldehyde (CH3CHO)**: This compound has one alpha-hydrogen (the hydrogen attached to the carbon adjacent to the carbonyl group). - **Formaldehyde (HCHO)**: This compound has no alpha-hydrogens since it has no carbon adjacent to the carbonyl carbon. ### Step 4: Determine the Reaction Since acetaldehyde has alpha-hydrogens, it can generate an enolate ion when treated with dilute NaOH. This enolate ion can then react with another molecule of acetaldehyde or with formaldehyde. - **Acetaldehyde + Acetaldehyde**: This will lead to the formation of a β-hydroxybutyraldehyde. - **Acetaldehyde + Formaldehyde**: The enolate ion from acetaldehyde can attack the carbonyl carbon of formaldehyde, leading to the formation of a β-hydroxy aldehyde. ### Step 5: Conclusion Both acetaldehyde and formaldehyde can participate in aldol condensation in the presence of dilute NaOH, with acetaldehyde being the one that generates the enolate ion. Thus, the correct answer is that **acetaldehyde and formaldehyde mixtures undergo aldol condensation**. ### Final Answer The compounds that undergo aldol condensation in the presence of dilute NaOH are acetaldehyde and formaldehyde. ---
To determine which compounds undergo aldol condensation in the presence of dilute NaOH, we can follow these steps: ### Step 1: Understand Aldol Condensation Aldol condensation is a reaction that occurs between two aldehydes or ketones that have at least one alpha-hydrogen. In the presence of a base like NaOH, one of the carbonyl compounds forms an enolate ion, which then attacks the carbonyl carbon of another molecule, leading to the formation of a β-hydroxy aldehyde or ketone. ### Step 2: Identify the Compounds Let's assume we have two aldehydes: acetaldehyde (CH3CHO) and formaldehyde (HCHO). We need to check if these compounds can undergo aldol condensation. ...
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