Problem: Use the molecular orbital diagram to figure out the electronic configuration for CN. Which of the following statements is correct?a) CN is diamagnetic.b) CN− is paramagnetic.c) If an electron is removed to give CN+, the bond order increases.d) The π*2p orbital is the highest energy orbital containing an electron in CNe) If an electron is added to give CN−, the bond length decreases. 

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FREE Expert Solution
FREE Expert Solution

We’re being asked to figure out the electronic configuration of CN and to determine which of the given statements is correct based on its molecular orbital diagram.


Let’s first draw the molecular orbital diagram for CN.

Step 1: Calculate the total valence electrons present.
Step 2: Fill the molecular orbitals with electrons.


Step 1: Calculate the total valence electrons present.

          Group             Valence Electrons
 C         4A                   1 x 4 e- = 4 e-
 N         5A                   1 x 5 e- = 5 e-
 __________________________________
                                Total: 9 valence e-


Step 2: Fill the molecular orbitals with electrons.

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Problem Details

Use the molecular orbital diagram to figure out the electronic configuration for CN. Which of the following statements is correct?

a) CN is diamagnetic.

b) CN is paramagnetic.

c) If an electron is removed to give CN+, the bond order increases.

d) The π*2p orbital is the highest energy orbital containing an electron in CN

e) If an electron is added to give CN, the bond length decreases.

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Based on our data, we think this problem is relevant for Professor Raghavachari & Jarrold's class at IU.