Which of the following is the least soluble in water?

n-Butyl alcohol

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n-Pentyl alcohol

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n-Hexyl alcohol

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n-Heptyl alcohol

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Solution

The correct option is D n-Heptyl alcohol
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.

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