CO₂: Carbon dioxide has a linear structure because the carbon atom is double-bonded to two oxygen atoms, with the bond angles being 180 degrees. H₂O: Water has a bent structure due to the lone pairs on the oxygen atom. SO₂: Sulfur dioxide has a bent structure due to the presence of lone pairs on the sulfur atom. NH₃: Ammonia has a pyramidal structure due to the lone pair on the nitrogen atom.