1) a: formamide.
2) c: hexanamide.
3) d: pentanediamide.
4) c: prop-2-enamida.
5) d: N-methylpropanamide.
6) b: propane-1,1,3-tricarboxamide.
7) da: 3-methylcyclopent-3-ene-1-carboxamide.
8) b: benzamide.
9) c: benzene-1,3-carboxamide.
10) b: 3-carbamoylpropanoic acid.