Treatment of propionaldehyde with dil. NaOH solution gives (a) CH3 CH2 COCH2 CH2 CHO (b) CH3 CH2

step 1 In this problem, this is the Aldol condensation reaction. So I'm writing it here. CH3, CH2, C do

Treatment of propionaldehyde with dil. NaOH solution gives...

Treatment of propionaldehyde with dil. $\mathrm{NaOH}$ solution gives (a) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$ (b) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHOHCH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$ (c) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHOHCH}\left(\mathrm{CH}_{3}\right) \mathrm{CHO}$ (d) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$

Treatment of propionaldehyde with dil. $\mathrm{NaOH}$ solution gives
(a) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$
(b) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHOHCH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$
(c) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHOHCH}\left(\mathrm{CH}_{3}\right) \mathrm{CHO}$
(d) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$

Key Concepts

Base Catalysis in Carbonyl Chemistry

Base catalysis involves the use of a basic medium to facilitate reactions of carbonyl compounds by deprotonating acidic ?-hydrogens and generating reactive intermediates like enolate ions. This catalysis is crucial in promoting nucleophilic addition processes, exemplified by the aldol reaction, and helps in achieving efficient and selective transformations in organic synthesis.

Self-Condensation Reaction

Self-condensation refers to the aldol reaction occurring between two molecules of the same aldehyde or ketone. In such cases, one molecule forms an enolate while the other serves as the carbonyl electrophile. This process is common with aldehydes that have readily abstractable ?-hydrogens and leads to the formation of products such as ?-hydroxy aldehydes or ketones.

Aldol Reaction

The aldol reaction is a fundamental carbon–carbon bond-forming process in organic chemistry where an enolate ion, generated from an aldehyde or ketone, acts as a nucleophile and adds to the carbonyl carbon of another molecule. This reaction can be catalyzed by bases (or acids) and results in the formation of ??hydroxy carbonyl compounds, which may undergo further dehydration to yield ?,??unsaturated carbonyl compounds.

Enolate Ion Formation

Under basic conditions, the ?-hydrogen of carbonyl compounds becomes sufficiently acidic to be abstracted, forming an enolate ion. This enolate is resonance stabilized, making it a potent nucleophile that can attack electrophilic carbonyl groups, a key step in aldol reactions and various other carbonyl chemistry transformations.

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