How many primary amine structural isomers are possible for the molecular formula ? — Amines Chemistry Question

💡 Solution & Explanation

A primary amine has the general formula $R-NH_2$. For $C_4H_{11}N$, the alkyl group $R$ must be a butyl group ($C_4H_9-$). There are 4 isomeric butyl groups: n-butyl (1-butanamine), sec-butyl (2-butanamine), isobutyl (2-methyl-1-propanamine), and tert-butyl (2-methyl-2-propanamine). Thus, exactly 4 primary amine isomers are possible.