Problem: Which of the following statements relating to molecular orbital (MO) theory is incorrect?a. Combination of two 2p orbitals may result in either sigma(σ) or pi(π) MOs.b. A species with a bond order of zero will not be stable.c. In a stable molecule having an even number of electrons, all electrons must be paired.d. Combination of two atomic orbitals produces one bonding and one antibonding MO.e. A bonding MO is lower in energy than the two atomic orbitals from which it is formed.

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Analyze each: 

a. Combination of two 2p orbitals may result in either sigma(σ) or pi(π) MOs.

  • True, p orbitals can result in both.


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Problem Details

Which of the following statements relating to molecular orbital (MO) theory is incorrect?

a. Combination of two 2p orbitals may result in either sigma(σ) or pi(π) MOs.

b. A species with a bond order of zero will not be stable.

c. In a stable molecule having an even number of electrons, all electrons must be paired.

d. Combination of two atomic orbitals produces one bonding and one antibonding MO.

e. A bonding MO is lower in energy than the two atomic orbitals from which it is formed.


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