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In the title compound, C19H15Cl2O2P, the dihedral angle between the mean planes of the phenyl rings bonded to the P atom is 75.4 (1)°. In the crystal, molecules are linked into chains running along the a axis by intermolecular O—H...O hydrogen bonds. Molecules are further connected into a three-dimensional array by weak C—H...O interactions.

The title compound, C19H14N2O4, crystallizes with two molecules with very similar conformations in the asymmetric unit; the angles between the two ring systems are 8.7 (1) and 4.2 (1)°. In the crystal, intermolecular π–π interactions [centroid–centroid distance 3.973 (1) Å] lead to a three-dimensional network.

The title compound, C19H10F5NO2, was synthesized by the 1:1 condensation of 2-methyl-8-hydroxyquinaldine with pentafluorobenzaldehyde. It crystallizes with two almost identical molecules in the asymmetric unit. The pentafluorobenzene ring is essentially coplanar with the quinoline ring, forming dihedral angles of 2.49 (17) and 8.72 (16)° in the two molecules.