MCQs on Valence Bond Theory In which year was the Valence bond theory introduced? (a) 1927 (b) 1920 (c) 1930 (d) 1935 The oxygen molecule is paramagnetic. It can be explained by (a) Resonance (b) Hybridisation (c) Valence bond theory (d) Molecular orbital theory Bond angle of 120° is found …