Exam 8: Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Classify cyclopentadienyl cation as aromatic,antiaromatic,or nonaromatic.Assume planarity of the π network.

Draw the important resonance contributing forms for the structure shown below.

When cycloheptatriene is deprotonated,an anion with seven resonance forms of equal energy can be drawn.Given this fact,explain why cycloheptatriene is only slightly more acidic than propene.

Which of the following is the weakest base?

Which of the following compounds is more stable? Explain.

Which of the following compounds contains the longest carbon-carbon single bond?

Is cyclooctatetraene a planar molecule? Explain.

Which of the following structures contributes most to the resonance hybrid.

Which of the following is antiaromatic?

Draw (Z)-1,3-hexadiene in its s-trans conformation.

Which of the following is the most stable diene?

In which of the following does resonance delocalization of electron density not play a role?

Which of the following is/are the major product(s)of the following reaction?

What diene and what dieneophile would be used to synthesize the following compound?

Which of the structures below would be aromatic?

Draw all major resonance contributors of the species below.

Provide the structure of the biologically significant heterocycle pyrimidine.

Draw all major resonance contributors of the species below.

Which of the following is/are the major product(s)of the following reaction?

Draw all major resonance contributors of the species below.