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The number of structural isomers possible from the molecular formula C3H9N is:

1. 4
2. 5
3. 2
4. 3

Correct answer: 4

Solution

The molecular formula C3H9N corresponds to amines. There are four possible structural isomers: one primary amine (propylamine), one secondary amine (isopropylamine), and two tertiary amines (N-methyl-ethylamine and trimethylamine).

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