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Pinacol, the starting diol of the pinacol-pinacolone rearrangement, has the IUPAC name

A2,3-dimethylbutane-2,3-diol
B2,3-dimethylbutane-1,2-diol
C3,3-dimethylbutane-1,2-diol
D2,2-dimethylbutane-1,3-diol

Answer: A

Pinacol is

(CH X_{3}) X_{2} C (OH) - C (OH) (CH X_{3}) X_{2}

: a butane chain with a methyl and a hydroxyl on each of C2 and C3. This is 2,3-dimethylbutane-2,3-diol.

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