1-Pentanol is more soluble in water than 2-pentanol because the hydroxyl group in 1-pentanol can form hydrogen bonds with water molecules. 2-Pentanol has a lower solubility in water because the hydroxyl group is located in the middle of the carbon chain, which makes it less accessible to water molecules.
The solubility of 1-pentanol in water is about 2.7 g/L at 25 °C, while the solubility of 2-pentanol in water is only about 0.4 g/L at 25 °C.
