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The number 1 in the names Ethan-1-ol, Propan-l-ol, Butan - l -ol etc is used to show that the functional group is attached to the first carbon of the straight carbon chain.
When naming the alkanols, always count from the side that gives the -OH the lowest number for example.

Count from the side that gives the carbon containing the OH the lowest number, regardless of the position of the branches.
Hence the name for the above alkanol is:-2, 3 - dimethyl Butan - 2- ol

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