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Chemical Bonding and Molecular Structure question

2020 · Q113
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Chemical Bonding and Molecular Structure question

2020 · Q113

NEETChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
Identify a molecule which does not exist.
  1. A
    Li2
  2. B
    C2
  3. C
    O2
  4. D
    He2
View written solutionFree

Correct answer: D

For He2 molecule
Total number of electron = 4
Electronic configuration is σ\sigma σ1s2, σ\sigma σ*1s2
Bond order = [Nb−Na]2{{[{N_b} - {N_a}]} \over 2}2[Nb​−Na​]​
= [2−2]2{{[2 - 2]} \over 2}2[2−2]​
= 0
So bond order = 0
So bond order = 0 (Remove this line, not needed.)
Since, bond order is zero, so He2 molecule does not exist.

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