Question

Which of the following is the least soluble in water?

• A. n-Butyl alcohol
• B. n-Pentyl alcohol
• C. n-Hexyl alcohol
• D. n-Heptyl alcohol

Answer 1

The correct option is D n-Heptyl alcohol

As size increases, hydrophobic part also increases and solubility in water decreases.
As the size of the alkyl group becomes larger, it prevents the formation of hydrogen bonds with water molecules and hence the solubility goes on decreasing with the increase in the size or mass of the compound.