The IUPAC name of :

3-methyl cyclobuten-2-ol

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4-Methyl cyclobut-2-en-1-ol

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4-methyl cyclobuten-3-ol

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2-methyl cyclobut-3-en-1-ol

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Solution

The correct option is B 4-Methyl cyclobut-2-en-1-ol
The parent hydrocarbon is cyclobutanol. (Since alcohol functional group has highest priority)
First carbon has hydroxyl group as substituent.
Fourth carbon has methyl group as substituent.
A double bond is present between second and third carbon atom.
Hence, the IUPAC name of given compound is $4 - m e t h y l c y c l o b u t - 2 - e n - 1 - o l$

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