MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCarboxylic Acids and DerivativesPreparation of Carboxylic Acid Derivatives

Maximum keto-enol tautomerism is shown by

A.CH3COOCH3

B.CH3COCH2CH3✓ Correct

C.CH3CH2COOCH2CH3

D.CH3COCH2COOC2H5

Explanation

Maximum Keto-enol tautomerism is shown by β- Keto-ester In this enol form is more stable due to formation of six membered cyclic (due to H-bonding) conjugated system. Carboxylic Acid and Its Derivatives 20 107. Which is more basic oxygen in an ester β O R C O R α (a) O denoted by (b) O denoted by (c) Both equally (d) None of the oxygen atoms is basic Due to resonance β oxygen is more basic

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