Answer: Acetal.
- A Acetal
- B Hemiacetal
- C Acetone
- D Formic acid
Correct answer: A. Acetal
Explanation: Two moles of alcohol react with one aldehyde in presence of HCl to form acetal (1,1-diethoxyethane).
Curved arrows show the nucleophile attacking the carbonyl carbon while the C=O pi electrons move onto oxygen, giving a tetrahedral alkoxide intermediate.
Concept context
Aldehydes, ketones, carboxylic acids, and their derivatives (esters, amides, acid chlorides). Key reactions include nucleophilic addition, Aldol condensation, Cannizzaro, and Claisen. Very heavily tested in JEE and NEET.
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