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  4. The compounds pyridine and planar cyclooctatetraene are .................. respectively

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Q. The compounds pyridine and planar cyclooctatetraene are .................. respectively

KEAMKEAM 2019Hydrocarbons

Solution:

The compounds pyridine and planar cyclooctatetraene are aromatic and anti-aromatic respectively. For a compound to be aromatic, it must be cyclic, planar. It must contain $(4 n+2) \pi$ electrons, where $n$ is any whole number.

Antiaromatic compounds are cyclic compounds with a $\pi$ electron system that has higher energy due to the presence of $4 n$ delocalised electrons in it.

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