Which molecule is a secondary amine?

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The concept being tested is how amines are classified by the number of carbon-containing groups attached to nitrogen. A secondary amine has two carbon substituents on nitrogen (R2NH). Dimethylamine fits this pattern because nitrogen is bound to two methyl groups and one hydrogen, giving the structure (CH3)2NH. Methylamine has only one carbon group attached to nitrogen, so it’s a primary amine. Trimethylamine has three carbon groups on nitrogen, making it a tertiary amine. Ammonia has no carbon substituents on nitrogen, so it’s not considered an amine in this classification.