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Which of the following compounds is known as pinacolone?

1. 2,3-Dimethyl-2,3-butanediol
2. 3,3-Dimethyl-2-butanone
3. 1-Phenyl-2-propanone
4. 1,1-Diphenyl-1,2-ethandiol

Correct answer: 3,3-Dimethyl-2-butanone

Solution

Pinacolone is the ketone (CH3)3C-CO-CH3, i.e. 3,3-dimethyl-2-butanone, formed by the pinacol-pinacolone rearrangement. The diol 2,3-dimethyl-2,3-butanediol is pinacol.

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