Which one of the following compound can undergo Aldol...

Which one of the following compound can undergo Aldol condensation?
(a)
<smiles>CC(C)=O</smiles>
(b) $\mathrm{CH}_{3}-\mathrm{CHO}$
(c) $\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CHO}$
(d) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}$

Key Concepts

Aldol Condensation Mechanism

Aldol condensation is an organic reaction in which a carbonyl compound with one or more alpha hydrogens is deprotonated under basic or acidic conditions to form an enolate ion or its equivalent. This nucleophilic species then adds to another carbonyl compound, forming a ?-hydroxycarbonyl intermediate that can often eliminate water to yield an ?,?-unsaturated carbonyl product.

Alpha Hydrogen Acidity

The presence and acidity of hydrogen atoms on the carbon adjacent to the carbonyl group (alpha hydrogen) are crucial in aldol condensation. These hydrogens are sufficiently acidic due to the electron-withdrawing effect of the carbonyl group, making them susceptible to deprotonation under base catalysis, thereby enabling enolate formation.

Enolate Ion Formation

Enolate ion formation is a key step in the aldol condensation process. Once the alpha hydrogen is removed, the resulting enolate ion, which benefits from resonance stabilization, acts as a nucleophile that attacks the electrophilic carbonyl carbon of another molecule of aldehyde or ketone, initiating the formation of the aldol adduct.

Structural Requirements for Reactivity

For a molecule to undergo aldol condensation, it must contain at least one alpha hydrogen adjacent to the carbonyl carbon. The ability to form a stabilized enolate ion and the structural accessibility of the carbonyl group are essential for the reaction to proceed, ensuring that only carbonyl compounds with appropriate substitution patterns can participate effectively.

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