The IUPAC name of isobutylamine is

isopropyl methyl amine

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isopropyl methanamine

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2-methylpropan-1-amine

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2-methylpropan-3-amine

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Solution

The correct option is C 2-methylpropan-1-amine
The structure of isobutylamine is given above. Since the longest chain has 3 carbon atoms, it is called propan. $N H_{2}$ is an amino group.
Hence, the IUPAC name is 2-methylpropan-1-amine.

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