How many distinct aldol condensation products (excluding stereoisomers) can be formed when an equimolar mixture of ethanal and propanal is treated with dilute ?
Answer and explanation
Correct answer: C.
- Step 1: Both ethanal () and propanal () contain alpha-hydrogens and can act as electrophilic carbonyls or nucleophilic enolates.
- Step 2: Ethanal self-aldol yields one product; propanal self-aldol yields a second product.
- Step 3: Nucleophilic attack of ethanal enolate on propanal yields a third product; attack of propanal enolate on ethanal yields a fourth product.
- Step 4: In total, four constitutional cross-aldol condensation products are formed.
Answer
.
Why not the others: product occurs when only one species has alpha-hydrogens; considers only self-condensation products; and omits one cross-condensation pathway.
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