Question

1 point
Which of the following is a not a
Hückel (4n + 2) aromatic system?
O Benzene (C6H6)
O Annulene (C18H18)
O Cyclopentadienyl anion (C5H5-)
Cyclooctatetraene (C8H8)​

Answer 1

Answer:

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Answer 2

Answer:  

C) Cyclopentadienyl anion (C5H5-)

Explanation:

• As a result, the cyclic Cyclopentadienyl anion has a planar electron cloud that is cyclic and unbroken.  However, because it has 4 electrons in a conjugated system, it does not follow Hickel's rule.

• Thus, the cyclic cyclopentadienyl anion is planar and possesses a cyclic uninterrupted π electron cloud.  However, it does not follow Hickel's rule as it has 4 π electrons in a conjugated system. Thus, it is antiaromatic.