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  4. Which of the following species is/are anti-aromatic?

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Q. Which of the following species is/are anti-aromatic?

Organic Chemistry – Some Basic Principles and Techniques

Solution:

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Has eight delocalised pi-electron-satisfy 4n pi-electrons rule, hence anti-aromatic.
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Has eight delocalised $pi$ -electrons, satisfy $4n$ pi-electrons rule, hence anti-aromatic. $B$ and $c$ are both aromatic.