Write structures of different isomers corresponding to the molecular formula $C_{3} H_{9} N$ . Write $I U P A C$ names of the isomers which will liberate nitrogen gas on treatment with nitrous acid.

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Solution

$Structural Isomers$
The compounds having same chemical formula but having different structures due to different arrangement of atoms/chains.

$Structures of different isomers and their IUPAC name$
Possible structures of different isomers corresponding to the molecular formula $C_{3} H_{9} N$ and their $I U P A C$ name shown below.

$Reaction with nitrous acid$
Only $1^{\circ}$ amines will liberate nitrogen gas on treatment with nitrous acid other amine not able to liberate nitrogen with $H N O_{2}$ . Hence only $(i)$ propanamine and $(i i)$ Propan- $2$ -amine, will liberate nitrogen gas on treatment with nitrous acid.

Reactions of both amines with $H N O_{2}$ is shown below:

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