In the title compound, C11H12ClNO3, the N—C=O fragment is twisted from the plane of the attached benzene ring by 48.39 (12)°. The carboxylic acid group is involved in O—H⋯O hydrogen bonding, which links pairs of molecules into centrosymmetric dimers. N—H⋯O hydrogen bonds link these dimers, related by translation along the a axis, into ribbons.
In the title compound, C12H9ClN2O4S, the dihedral angle between the aromatic rings is 70.27 (8)°. In the crystal, molecules are linked by pairs of N—H...O(S) hydrogen bonds, forming inversion dimers.
In the title compound, C12H10N2O4S, the dihedral angle between the aromatic rings is 36.19 (18)°. In the crystal, N—H⋯O hydrogen bonds link the molecules into C(4) chains running along the a axis.
In the crystal of the title compound, C13H12N2O4S, the conformation of the N—H bond in the –SO2—NH– segment is syn to the ortho-nitro group in the sulfonyl benzene ring. The molecule is twisted at the S—N bond with a torsion angle of 76.55 (18)°. The dihedral angle between the planes of the rings is 72.64 (8)°. In the crystal, molecules are linked by pairs of N—H⋯O(S) hydrogen bonds to form inversion dimers.
In the title compound, C15H15NO, the amide fragment has an anti conformation. The central amide group is tilted with respect to the benzoyl ring, forming a dihedral angle of 32.3 (5)°. The benzoyl and aniline rings make a dihedral angle of 59.6 (5)°. Molecules are linked into infinite supramolecular chains via N—H⋯O hydrogen bonds. The molecule is disordered so that the aromatic rings are disposed across a twofold axis with equal occupancies.
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