(E)-1-(4-Chloro­phen­yl)ethanone semi­carbazone

In the title compound, C(9)H(10)ClN(3)O, the semicarbazone group is approximately planar, with an r.m.s. deviation from the mean plane of 0.054 (1) Å. The dihedral angle between the least-squares planes through the semicarbazone group and the benzene ring is 30.46 (5)°. In the solid state, mol­ecules are linked via inter­molecular N—H⋯O and N—H⋯N hydrogen bonds, generating R (2) (2)(9) ring motifs which, together with R (2) (2)(8) ring motifs formed by pairs of inter­molecular N—H⋯O hydrogen bonds, lead to the formation of a seldom-observed mol­ecular trimer. Furthermore, N—H⋯O hydrogen bonds form R (2) (1)(7) ring motifs with C—H⋯O hydrogen bonds, further consolidating the crystal structure. Mol­ecules are linked by these inter­molecular inter­actions, forming two-dimensional networks parallel to (100).