In the title compound, C(16)H(13)FO(4), the dihedral angle between the benzene rings is 84.28 (8)°. In the crystal, C-H⋯F and C-H⋯O hydrogen bonds link the mol-ecules to form a three-dimensional network. The crystal structure is consolidated by C-H⋯π inter-actions and short F⋯F contacts [2.7748 (14) Å] also occur.

The asymmetric unit of the title compound, C(15)H(10)BrClO(3), consists of three crystallographically independent mol-ecules. The dihedral angles between the benzene rings in the three mol-ecules are 68.8 (2), 0.7 (3) and 66.1 (2)°. In the crystal, the three independent mol-ecules are inter-connected by C-H⋯O hydrogen bonds, leading to isolated trimers.

The asymmetric unit of the title compound, C(15)H(10)Br(2)O(3), consists of three crystallographically independent mol-ecules (A, B and C). The phenyl rings in mol-ecules A, B and C make dihedral angles of 6.1 (3), 3.2 (2) and 54.6 (2)° to each other, respectively. In the crystal, mol-ecules are linked into two-dimensional layers parallel to the ab plane by inter-molecular C-H⋯O hydrogen bonds....

In the title compound, C(15)H(11)BrO(4), the dihedral angle between the aromatic rings is 66.77 (8)°. In the crystal, O-H⋯O, C-H⋯Br and C-H⋯O hydrogen bonds link the mol-ecules, forming layers lying parallel to (101). The crystal packing is further consolidated by C-H⋯π inter-actions and π-π stacking inter-actions [centroid-centroid distance = 3.5476 (7) Å].

The title compound, C(15)H(11)ClO(4), consists of a chloro-benzene ring and a phenol ring which are linked together by a 1,4-dioxo-2-oxabutane-1,4-diyl group. The dihedral angle between the chloro-benzene and phenol rings is 65.70 (11)°. In the crystal, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into chains along [010].