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JEE Main2013ChemistryChemical Bonding and Molecular StructureActual

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

Options

  1. AH 2 2 + , He 2
  2. BH 2 - , He 2 2 +
  3. CH 2 + , He 2 2 -
  4. DH 2 - , He 2 2 -

Correct answer

A. H 2 2 + , He 2

Step-by-step solution

(i) H 2 2 + ⇒ B . O = 0 He 2 ⇒ B . O = 2 - 2 2 = 0 (ii) H 2 - ⇒ B . O = 2 - 1 2 = 0 . 5 He 2 2+ ⇒ B . O = 1 (iii) H 2 + = B . O = 1 - 0 2 = 0 . 5 He 2 2 - = B . O = 4 - 2 2 = 1 . 0 (iv) H 2 - ⇒ B . O = 2 - 1 2 = 0 . 5 He 2 2 - ⇒ B . O = 4 - 2 2 = 1 . 0 As both H 2 2+ and He 2 have zero bond order and hence do not exist.

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