Which one of the following compounds is antiaromatic?
A) I
B) II
C) III
D) IV
E) none of these

Name: Which one of the following compounds is antiaromatic? A) I B) II C) III D) IV E) none of these
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Question

Which one of the following compounds is antiaromatic? 
A) I 
B) II 
C) III 
D) IV 
E) none of these

Quizplus · Accepted Answer

Compound III has a planar, cyclic arrangement of π electrons, but only 4 π electrons, which is an odd number, making it antiaromatic. The other compounds either have non-planar structures or contain a number of π electrons that is not equal to 4n, where n is an integer, and are thus not antiaromatic.

Which One of the Following Compounds Is Antiaromatic