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Q.

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

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a

H2+,He22-

b

H2,He22-

c

H2+,He2

d

H2,He22+

answer is C.

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Detailed Solution

Species having zero or negative bond order do not exist.H22+(1+1-2=0)=σ1s0Bond order = 0He2(2+2=4)=σ1s2,σ*1s2 Bond order =Nb-Na2=2-22=0 So, both H22+ and He2 do not exist.
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