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In the title compound, C10H9N3, the benzimidazol-2-amine and CH2—C[triple-bond]CH units are not coplanar, with a dihedral angle of 60.36° between their mean planes. The crystal structure is stabilized by intermolecular N—H...N hydrogen bonding and π–π interactions [centroid–centroid distances 3.677 (1) and 3.580 (1) Å], assembling the molecules into a supramolecular structure with a three-dimensional network.

The title compound, C15H9ClO2, is a synthetic flavonoid obtained by the cyclization of 3-(4-chlorophenyl)-1-(2-hydroxyphenyl)prop-2-en-1-one. The 4-chlorophenyl ring is twisted at an angle of 11.54° with respect to the chromen-4-one skeleton. In the crystal, pairs of molecules are interconnected by weak Cl...Cl interactions [3.3089 (10) Å] forming dimmers which are further peripherally connected through intermolecular C—H...O hydrogen bonds.

In the title compound, C10H8N2S, the 2-aminobenzothiazole and propyne groups are not coplanar [dihedral angle = 71.51 (1)°]. The crystal structure is stabilized by strong intermolecular N—H...N hydrogen bonds and C—H...C, C—H...π and F-type aromatic–aromatic [centroid–centroid distance = 3.7826 (12) Å] interactions are also observed.

The title compound, C15H11Cl2NO, is approximately planar (r.m.s. deviation = 0.062 Å) and contains a single C=C double bond in a trans (E) configuration. The crystal packing is stabilized by intermolecular N—H...N and N—H...O intermolecular hydrogen bonding.

In the crystal of the title compound, C17H20N2O2, the molecules are linked by C—H...O interactions. Intramolecular C—H...O and N—H...N hydrogen bonds also occur.

The title compound, C14H11ClFNO2, the phenyl ring (A), the chlorofluorophenyl ring (B) and the central ketone O/C/O group (C) are not coplanar, with dihedral angles B/C = 31.6 (2), A/B = 21.3 (2) and A/C = 50.1 (2)°. The crystal packing is stabilized by N—H...O and C—H...O interactions.