The pKa of cyclopentadiene is much smaller than typical for an allylic hydrocarbon. The best explanation for this observation is:   Question 17 options:   Cyclopentadiene is much more stable than expected.   Cyclopentadiene is much less stable than expected.   The cyclopentadienyl anion is aromatic.   The cyclopentadienyl anion is antiaromatic.

Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
Chapter19: Eas: Electrophilic Aromatic Substitution
Section: Chapter Questions
Problem 19E
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The pKa of cyclopentadiene is much smaller than typical for an allylic hydrocarbon. The best explanation for this observation is:
 

Question 17 options:

 
Cyclopentadiene is much more stable than expected.
 
Cyclopentadiene is much less stable than expected.
 
The cyclopentadienyl anion is aromatic.
 
The cyclopentadienyl anion is antiaromatic.
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