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Question

Cyclobutadiene is said to be:


Your Answer
A
Aromatic 
Your Answer
B
Aliphatic
Correct Answer
C
Anti-aromatic 
Your Answer
D
None of the above 

Solution

The correct option is B Anti-aromatic 
According to Huckel's rule, if a cyclic, planar molecule has (4n + 2) π electrons, it is considered to be aromatic. 

Aliphatic compounds are chemical compounds belonging to the organic class in which the atoms are not linked together to form a ring. They are non-aromatic compounds. 

Antiaromaticity is a characteristic of a cyclic molecule with a π-electron system that has higher energy due to the presence of 4n π~electrons in it. 

Unlike aromatic compounds, which follow Huckel's rule [(4n + 2) π-electrons] and are highly stable, antiaromatic compounds are highly unstable and highly reactive. 

So, cyclobutadiene is an anti-aromatic compound as it is a cyclic and planar molecule having 4 π-electrons.

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