Q.

Identify a molecule which does not exist

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a

O2

b

He2

c

Li2

d

C2

answer is B.

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Detailed Solution

He2=Total electron =4=σ1σ2=σ1σ∗2⇒B⋅O⋅=12[Nb−Na]=12[2−2]=0Bond order =0, so He2 does not exist.
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Identify a molecule which does not exist