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NTA Abhyas JEE Main2020ChemistryChemical Bonding and Molecular StructurePractice

Stability of the species L i 2 , L i 2 - and L i 2 + increases in the order of

Options

  1. AL i 2 - < L i 2 < L i 2 +
  2. BL i 2 - < L i 2 + < L i 2
  3. CL i 2 < L i 2 - < L i 2 +
  4. DL i 2 < L i 2 + < L i 2 -

Correct answer

B. L i 2 - < L i 2 + < L i 2

Step-by-step solution

L i 2 : σ 1 s 2 σ 1 s * 2 σ 1 s 2 Bond order = 1 L i 2 + : σ 1 s 2 σ 1 s * 2 σ 2 s 1 Bond order = 0.5 L i 2 - : σ 1 s 2 σ 1 s * 2 σ 2 s 2 σ 2 s * 1 Bond order = 0.5 L i 2 - is less stable than L i 2 + because the incoming electron goes to anti bonding molecular orbital. So, the stability order is L i 2 > L i 2 + > L i 2 - .

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