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Q.

Which of the following molecular orbital has the lowest energy ?

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a

σ2pz

b

σ*2pz

c

π*2px

d

π*2py

answer is A.

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Detailed Solution

The relative energies of molecular orbitals are found to be in increasing order as follows-

 σ(1s)<σ∗(1s)<σ(2s)<σ∗(2s)<[π(2py) π(2px)]<σ(2pz)<[π∗(2py) π∗(2px)]<σ∗(2pz)

Energy of bonding orbitals is less than antibonding orbital so σ2pz has lowest energy than other given.

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