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The asymmetric unit of the title compound, C(19)H(12)Cl(2)O, contains four independent mol-ecules, which can be divided into two pairs of mol-ecules with close values of the C-C(=O)-C=C torsion angles in each pair, viz. 165.12 (16) and 165.68 (15)° in one pair, and -164.66 (15) and -164.81 (15)° in the other pair. The crystal packing exhibits short inter-molecular Cl⋯Cl contacts of 3.362 (1) Å.

In the title compound, C(21)H(16)Cl(2)N(2)O, the central pyrazoline ring makes dihedral angles of 90.1 (3) and 7.8 (3)°, with the pendant benzene ring and naphthalene ring system, respectively. In the crystal structure, weak C-H⋯O inter-actions lead to chains of mol-ecules.

In the title compound, C(24)H(24)N(2)O(4), the pendant benzene and naphthalene ring systems make dihedral angles of 87.9 (3) and 19.2 (3)°, respectively, with the central pyrazoline ring. In the crystal structure, weak C-H⋯O inter-actions help to establish the packing.