Question

# According to molecular orbital theory, which of the following will not exist?

A
H+2
B
Be2
C
B2
D
C2

Solution

## The correct option is B $$Be_2$$According to the molecular orbital theory elements which have bond order negative or $$0$$ will not exist.Formula to calculate bond order $$=\dfrac { Number\ of \ electrons\ in\ BMO -\quad Number\ of\ electrons\ in\ ABMO }{ 2 }$$where, $$BMO=$$ Bonding molecular orbital            $$ABMO=$$ Antibonding molecular orbitalMolecular electronic configuation of $$Be_2=\sigma 1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2$$$$Be_2$$ has $$4$$ electrons in $$BMO$$ and $$4$$ in $$ABMO$$ so the bond order will come $$0$$.So, the correct option is $$[B].$$Chemistry

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