In the title chalcone derivative, C15H9Cl2FO, the dihedral angle between the aromatic rings is 19.13 (15)° and the double bond adopts an E conformation. In the crystal, molecules are connected by weak C—H⋯O hydrogen bonds, forming a chain propagating along the [001] direction.
Keywords: crystal structure; chalcone derivative; prop-2-en-1-one; hydrogen bonding.