Question

In which of the following pairs of molecules/ions, both the
species are not likely to exist ?
(a) H₂⁺ ,He₂²⁻ (b) H₂⁻ ,He₂²⁻
(c) H₂²⁺ ,He₂ (d) H₂⁻ ,He₂²⁺

Answer 1

The molecules/ions, both the  species are not likely to exist are  H₂²⁺, He₂.

Explanation:

Species having zero or negative bond order does not exist.

B2^+2 (1 + 1 − 2 = 0) = σ1s^0

Bond order =0

He2 ( 2 + 2 = 4) = σ1s2, σ1s2  

Bond order = Nb − Na2 = 2 − 22 = 0

So, both H2+2 and He2 do not exist.

Hence the molecules/ions, both the  species are not likely to exist are  H₂²⁺ ,He₂.

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