The restrictions on the placing of electrons in molecular orbitals in molecules

Question

The restrictions on the placing of electrons in molecular orbitals in molecules and ions a. must obey the Pauli exclusion principle but not Hund's rule or the Aufbau principle. b. must obey the Pauli exclusion principle and the Aufbau principle but not Hund's rule. c. must obey the Aufbau principle but not the Pauli exclusion principle or Hund's rule. d. are not governed by either the Aufbau principle, Hund's rule, or the Pauli exclusion principle. e. must obey the Aufbau principle, Hund's rule, and the Pauli exclusion principle. Consider the cyclobutadiene structure shown below. How many bonds are there? C_C C_C a. b. 2 c. 3 d. 4 e. 8

Explanation / Answer

The atomic orbitals overlap to for molecular orbitals. They have same chemical properties as that of atomic orbitals, and follow same quantum rules. So the answer is e) must obey the afbau principle,hund's rule and pauli exclusion principle.

In each double bond, there is one sigma and one pi bond. So in the given structure there are two pi bonds.

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