Which from following compounds is an example of primary amines?

Step-by-step solution

A primary amine has the nitrogen atom bonded to one alkyl or aryl group and two hydrogen atoms. N-methylmethanamine: Contains a methyl group substitution on nitrogen, resulting in the structure CH₃-NH-CH₃ , making it secondary. 4-Bromobenzenamine: Consists of a single aryl group and two hydrogens on nitrogen, conforming to Ar-NH₂ , hence primary. N-Phenylbenzenamine: Nitrogen bonds to two aryl groups as C₆ H₅-NH-C₆ H₅ , classifying it as secondary. N-Ethyl-N-methylpropan-2-amine: The structure is (CH₃)2CH-N(CH₃)(C₂