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KCET2009ChemistryChemical Bonding and Molecular Structure

The correct statement with regard to H ₂⁺ and H ₂⁻ is

Options

  1. Aboth H ₂⁺ and H ₂⁻ are equally stable
  2. Bboth H ₂⁺ and H ₂⁻ do not exist
  3. CH ₂⁻ is more stable than H ₂⁺
  4. DH ₂⁺ is more stable than H ₂⁻

Correct answer

D. H ₂⁺ is more stable than H ₂⁻

Step-by-step solution

H ₂⁺: 1 ~s ¹, * 1 ~s ⁰ Bond order = 1 2 H ₂⁻: 1 ~s ², * 1 ~s ¹ Bond order = 2-1 2 = 1 2 The bond order of H ₂⁺ and H ₂⁻ are same but H ₂⁺ is more stable than H ₂⁻ . It is due to the presence of one electron in the antibonding molecular orbital in H ₂⁻ .

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