Molecule A. This is glycine - the simplest of the amino acids. The systematic name is 2- aminoethanoic acid
Amine
Molecule B. This is a simple aliphatic amine with two carbon atoms called ethylamine ( or ethanamine) . Ethylamine can be formed by the reaction of chloroethane with ammonia dissolved in ethanol.
Amide
Molecule C . This is an amide called ethanamide. Amides can be formed by the violent reaction of acyl chlorides with concentrated ammoniasolution
Amides can be named from the acyl chloride from which they are derived. For example : ethanoyl chloride becomes ethanamide.