Which of the following facts given is not correct ? (I) Bond length order : H2^- = H2^+ > H2 (II) O2 — Chemical Bonding Chemistry Question

💡 Solution & Explanation

Step 1: Analyze statement (I): H2- and H2+ both have a bond order of 0.5, which is smaller than that of H2 (1.0). While H2- is slightly longer than H2+ due to electron-electron repulsion, they are often approximated as equal, but exact symmetry is not maintained. More importantly, check statement (IV). Step 2: In NO3^-, Nitrogen forms a delocalized pi system giving a bond order of 1.33. In BO3^3-, Boron forms only single bonds with a bond order of 1.0. Thus, they do not have the same bond order, making statement (IV) strictly incorrect. Step 3: Since statement (IV) is incorrect and statement (I) contains an oversimplification (or is incorrect), the pair of incorrect facts is represented by option (b).