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JEE Main2018ChemistryChemical Bonding and Molecular StructureActual

According to molecular orbital theory, which of the following molecule will not be available?

Options

  1. AH 2 2 -
  2. BHe 2 2 +
  3. CHe 2 +
  4. DH 2 -

Correct answer

A. H 2 2 -

Step-by-step solution

The electronic configuration of H 2 2 ⊖ is ⇒       σ 1 s 2 ,   σ * 1 s 2 Bond order of H 2 2 ⊝ = N b - N a 2 = 2 - 2 2 = 0 Hence, H 2 2 ⊖ does not exist, due to zero bond order.

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