Which of the following compounds is not aroma | vedclass

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

Question

(A) To determine aromaticity,we use $H$ückel's rule: a compound must be cyclic,planar,fully conjugated,and have $(4n + 2) \pi$ electrons.$A$. Cyclopen

Vedclass · Accepted Answer

Cyclopentadienyl cation

Vedclass · Answer

(A) To determine aromaticity,we use $H$ückel's rule: a compound must be cyclic,planar,fully conjugated,and have $(4n + 2) \pi$ electrons.$A$. Cyclopentadienyl cation: It has $4 \pi$ electrons. According to $H$ückel's rule,it is anti-aromatic.$B$. Pyrrole: It has $6 \pi$ electrons ($4$ from double bonds + $2$ from the lone pair on $N$). It is aromatic.$C$. Pyridine: It has $6 \pi$ electrons. It is aromatic.$D$. Cyclopentadienyl anion: It has $6 \pi$ electrons ($4$ from double bonds + $2$ from the negative charge). It is aromatic.Therefore,the cyclopentadienyl cation is not aromatic (it is anti-aromatic).

Which of the following compounds is not aromatic?

Similar Questions

What is meant by a meta-directing group? Give examples of it and explain the meta-directing effect of $-NO_2$.

When acetylene is passed through a red hot iron tube,compound $X$ is formed. Which one of the following reactions will yield $X$ as the major product?

$TNT$ has the structure

Predict the major product of the reaction of $1$-ethyl-$3$-methylbenzene with $KMnO_4$ in an acidic medium under heating.

(no ring substitution) Product $(A)$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module