In which of the following pairs

Question:

In which of the following pairs of molecules/ions, both the species are not likely to exist ?

  1. $\mathrm{H}_{2}^{+}, \mathrm{He}_{2}^{2-}$

  2. $\mathrm{H}_{2}^{-}, \mathrm{He}_{2}^{2-}$

  3. $\mathrm{H}_{2}^{2+}, \mathrm{He}_{2}$

  4. $\mathrm{H}_{2}^{-}, \mathrm{He}_{2}^{2+}$


Correct Option: , 3

Solution:

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