Which one of the following pairs of compounds are functional isomers?

Which one of the following pairs of compounds are functional isomers?
  1. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH},\left(\mathrm{CH}_3ight)_2 \mathrm{CHCH}_2 \mathrm{OH}$
  2. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH},\left(\mathrm{CH}_3ight)_2 \mathrm{CHCH}_2 \mathrm{OH}$
  3. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH}, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Cl}$
  4. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH}, \mathrm{CH}_3-\mathrm{O}-\mathrm{CH}_2 \mathrm{CH}_3$

Solution

In option (d) there are two different functional groups i.e., $-\mathrm{OH}$ and $-\mathrm{O}-$. So, these are functional isomers.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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