Crystal structure of 1-(4-bromo-phen-yl)but-3-yn-1-one.

The title compound, 1-(4-bromo-phen-yl)but-3-yn-1-one, C 10 H 7 BrO, crystallizes in the monoclinic space group P 2 1 / n with one mol-ecule in the asymmetric unit. The structure displays a planar geometry. The crystal structure is consolidated by C-H⋯O hydrogen bonding and a short C=O⋯C≡C (acetyl-ene) contacts. Hirshfeld surface analysis indicates that H⋯H, C⋯H/H⋯C and H⋯Br/Br⋯H inter-actions play a more important role in consolidating the crystal structure compared to H⋯O/O⋯H and C⋯C contacts.