Which of the following annulenes is not aromatic?
A) [6]-annulene
B) [14]-annulene
C) [16]-annulene
D) [18]-annulene
E) [22]-annulene

Question

Quizplus · Accepted Answer

[16]-annulene is not aromatic because it does not follow Hückel's rule, which requires a planar, cyclic molecule with 4n+2 π electrons. [16]-annulene has 16 π electrons, which fits the 4n rule (where n=4) instead, indicating it is antiaromatic or non-aromatic if it cannot maintain planarity.

Which of the Following Annulenes Is Not Aromatic