Butan - 1-ol \text { Butan - 1-ol } Butan - 1-ol
Butan - 2-ol \text { Butan - 2-ol } Butan - 2-ol
2 - methylpropan - 1 - ol 2 \text { - methylpropan - } 1 \text { - ol }2 - methylpropan - 1 - ol
2 - methylpropan −2− ol 2 \text { - methylpropan }-2-\text { ol }2 - methylpropan −2− ol