Frost Circle Practice Problems

What is the Frost circle diagram for the following molecule? Is it expected to be antiaromatic or aromatic?

Provide the Frost diagram for the given ion. Determine whether it is aromatic or antiaromatic.

(a) Include the electrons required to make the following partial Frost diagram for a five-membered ring representing an aromatic molecule. (b) Provide the structure that would correspond to it.

Construct the Frost circles for the cyclopentadienyl anion and cyclopentadienyl cation. What is their difference? 

Illustrate the Frost circles for the cycloheptatrienyl anion and cycloheptatrienyl cation. Differentiate the two.

Draw a molecular orbital diagram for the following compound using Frost circle and determine whether it is aromatic or antiaromatic.

The Frost circle was used to draw the molecular orbital energy diagram of cyclononatetraenyl anion. Using this diagram, it was determined that cyclononatetraenyl anion is antiaromatic. Is this correct? Justify your answer.

Why are all the carbon-carbon bonds in benzene of the same length (1.39 Å)? Note: The average bond length of C―C is 1.53 Å and C=C is 1.31 Å.

Draw the energy levels of the molecular orbitals for cyclopentadienyl cation, show the distribution of pi electrons, and determine whether it is aromatic or not.

Draw the energy levels of the molecular orbitals for cyclopentadienyl anion, show the distribution of pi electrons, and determine whether it is aromatic or not.

Using the polygon method, draw the energy level diagram of the molecular orbitals for cyclopentadienyl cation. Is cyclopentadienyl cation aromatic?