Which of the following carbonyl compounds does NOT undergo aldol condensation in the presence of dilute alkali?
Answer and explanation
Correct answer: B. Benzaldehyde
- Step 1: For a carbonyl compound to undergo aldol condensation, it must possess at least one alpha-hydrogen atom.
- Step 2: Benzaldehyde () has its formyl group attached directly to an aromatic carbon bearing no hydrogen atom, lacking alpha-hydrogens.
- Step 3: Therefore, benzaldehyde cannot undergo self-aldol condensation (it undergoes the Cannizzaro reaction instead).
Answer
Benzaldehyde.
Why not the others: Acetaldehyde has 3 alpha-hydrogens; propanal has 2 alpha-hydrogens; and acetone has 6 alpha-hydrogens.
Practise more Inorganic and Organic Functional Groups.
Free questions with an explanation for every one, and full timed CBSE Class 12 mock tests.
More Inorganic and Organic Functional Groups questions
- What happens when tertiary butyl bromide reacts with sodium methoxide in the Williamson ether synthesis?
- What products are obtained when formaldehyde () is heated with concentrated () sodium hydroxide solution?
- Tollens' reagent (ammoniacal silver nitrate solution) is used to distinguish aldehydes from ketones. What is the observable positive result?
- Which reagent combination is utilized in the Clemmensen reduction to convert a carbonyl group () into a methylene group…
- What product is obtained when propanoic acid is treated with bromine in the presence of red phosphorus followed by hydrolysis?
- Which of the following substituted acetic acids is the strongest Brønsted acid in aqueous solution?