Which one of the following alcohols will be soluble in water?
3-hexanol
2-propanol
2-butanol
2-pentanol

The following alcohols will be soluble in water:

2-propanol

Explanation:

Alcohols are soluble in water and have high boiling point because they form hydrogen-bond with water molecules

The solubility decreases with  increase in size of alkyl/aryl (hydrophobic)

groups.

This is because with Higher molecules the extent of Hydrogen bonding decreases due to more hydrophobic interactions(water repelling)

Branching reduces the surface area of the molecules , hence reduces the hydrophobic interaction . Thus increases the solubility or boiling point.

The lower  molecular mass alcohols are miscible  with water in all proportions.

3-hexanol  = 6-Carbon = minimum solubility

2-propanol  = 3 carbon = Maximum solubility

2-butanol  = 4 carbon

2-pentanol = 5 carbon

Thus 2- Propanol is olube in water.

Here Branching does not affect solubility because each molecule id equally branched.

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