Identify the anti-aromatic compound.

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) compound is anti-aromatic if it is cyclic,planar,fully conjugated,and contains $4n$ $\pi$-electrons (where $n = 1, 2, ...$).$A$. Pyrrole cation: I

Vedclass · Accepted Answer

Cyclobutadiene

Vedclass · Answer

(B) compound is anti-aromatic if it is cyclic,planar,fully conjugated,and contains $4n$ $\pi$-electrons (where $n = 1, 2, ...$).$A$. Pyrrole cation: It has $6$ $\pi$-electrons ($4$ from double bonds and $2$ from the lone pair on nitrogen,but here the nitrogen is protonated,so it has $4$ $\pi$-electrons). However,it is not planar due to $sp^3$ hybridization at the nitrogen atom.$B$. Cyclobutadiene: It is a cyclic,planar,fully conjugated system with $4$ $\pi$-electrons ($4n$ where $n=1$). Thus,it is anti-aromatic.$C$. Cyclopentadiene: It is not fully conjugated because of the $sp^3$ hybridized carbon atom. Thus,it is non-aromatic.$D$. Cyclooctatetraene: It is non-planar (tub-shaped) to avoid anti-aromaticity. Thus,it is non-aromatic.Therefore,the correct answer is $B$.

Similar Questions

Which product is obtained by the oxidation of ethylbenzene with $KMnO_4$?

Which of the following statements about tropone is true?

$ArH + R - C(=O) - Cl \xrightarrow{\text{Lewis acid}} Ar - C(=O) - R + HCl$ is an example of

Ozonolysis of $o$-xylene produces:

In chlorination of benzene,the reactive species is

Vedclass Test Series

Exam Paper Generator

Online Exam Module