description of a polar covalent bond a formula of an alkane expands its octet polar compound ortho, para, meta forms of dichlorobenzene description of a non-polar covalent bond a formula of an alkyne free radical a formula of an alkene or cycloalkane a formula of an aromatic compound [Choose ] an unequally shared pair of electrons an equally shared pair of electrons C6H6 nitrogen phosphorus HCN NO2 C4H10 C2H2 cis-trans isomers Gilbert Lewis constitutional isomers C6H12 [Choose ] [Choose ] [Choose ] [Choose ] [Choose ]