Final answer:
PBr3 (phosphorus tribromide) has polar covalent bonds because there is an electronegativity difference between phosphorus and bromine. Additionally, the molecular shape of PBr3 is trigonal pyramidal, which is asymmetrical and leads to an overall molecular dipole.
Step-by-step explanation:
A polar covalent bond is a type of covalent bond where the shared electrons are unequally distributed between the atoms. A molecule can be classified as polar if it has polar covalent bonds and the molecular shape is asymmetrical. PBr3 (phosphorus tribromide) has polar covalent bonds because there is an electronegativity difference between phosphorus and bromine. Additionally, the molecular shape of PBr3 is trigonal pyramidal, which is asymmetrical and leads to an overall molecular dipole.