In the title compound, C18H13ClFNO, the dihedral angle between the mean planes of the chloro- and fluoro-substituted benzene ring and the naphthalene ring system is 60.5 (8)°. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming a zigzag chain along [101].

In the title compound, C15H8Cl2F2O, the C=C double bond is in the E configuration. In the cyrstal, C—H⋯O hydrogen bonds connect the mol­ecules into chains along the c axis. A π–π inter­action of 3.628 (1) Å is also observed between two polyhalogenated benzene rings. The dichloro­substituted ring exhibits partial disorder over two sets of sites, with site-occupancy factors of 0.573 (3) and 0.427 (3).

In the crystal structure of the title salt, C6H7ClN+·C7H7O3S−, the cations and anions are linked via N—H⋯O hydrogen bonds into double chains in [101]. Weak inter­molecular C—H⋯π-ring inter­actions link these chains into layers parallel to the ac plane.

In the title compound, C16H13ClN2OS·H2O, the dihedral angle between the mean planes of the benzothia­zole ring system and the methylphenyl ring is 79.3 (6)°. The crystal packing features inter­molecular O—H⋯N, O—H⋯O and N—H⋯O hydrogen bonds involving the water mol­ecule and weak C—H⋯O, C—H⋯Cg and π–π stacking inter­actions [centroid–centroid distances = 3.8743 (7), 3.7229 (7) and 3.7076 (8) Å].

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