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In the modern IUPAC Nomenclature there is no such substance. It is either butan-1-ol or butan-2-ol. butan-3-ol is the equivalent to butan-2-ol , by counting the carbons from the right hand end. Similarly, there is no such substance as butan-4-ol; it is equivalent to butan-1-ol.

Structurally

butan-1-ol is CH3CH2CH2CH2OH

butan-2-ol is CH3CH2CH(OH)CH3

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lenpollock

Lvl 17
1y ago

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