IUPAC name of given compound is:

But-2-ene-2,3-diol

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Pent-2-ene-2,3-diol

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2-Methylbut-2-ene-2,3-diol

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Pent-3-ene-3,4-diol

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Solution

The correct option is B Pent-2-ene-2,3-diol
Pent-2-ene-2,3-diol
Functional group $- O H$ should get lowest numbering value.

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