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4.Chemical Bonding and Molecular Structure
medium
Identify a molecule which does not exist.
A
$O _{2}$
B
$He _{2}$
C
$Li _{2}$
D
$C _{2}$
(NEET-2020)
Solution
$He _{2}=$ Total electron $=4$
$=\sigma_{1 \sigma}^{2} \sigma_{1 \sigma}^{* 2} \Rightarrow B . O .=\frac{1}{2}[ Nb – Na ]=\frac{1}{2}[2-2]=0$
Bond order $=0,$ so $He _{2}$ does not exist.
Standard 11
Chemistry
