Which aromatic compound has two double bonds | vedclass

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

Question

(B) For a compound to be aromatic,it must follow $H$ückel's rule,which states that the compound must have $(4n + 2) \pi$ electrons,where $n$ is an int

Vedclass · Accepted Answer

Cyclopentadienyl anion

Vedclass · Answer

(B) For a compound to be aromatic,it must follow $H$ückel's rule,which states that the compound must have $(4n + 2) \pi$ electrons,where $n$ is an integer $(0, 1, 2, \dots)$.In a five-membered ring,to achieve aromaticity,the system must have $6 \pi$ electrons $(n=1)$.Cyclopentadiene has $4 \pi$ electrons and is non-aromatic.Cyclopentadienyl anion $(C_5H_5^-)$ has $2$ double bonds ($4 \pi$ electrons) and a lone pair on the $sp^3$ carbon,which participates in resonance,providing a total of $6 \pi$ electrons. This makes it aromatic.Therefore,the cyclopentadienyl anion is the correct aromatic species.

Which aromatic compound has two double bonds and a five-membered ring?

Similar Questions

Benzene and its derivatives readily undergo which of the following reactions?

The product obtained by the reaction of benzene with concentrated $HNO_3$ and concentrated $H_2SO_4$ at $353$ to $363 \, K$ is....

The radical,$C_6H_5CH_2^{\bullet}$,is aromatic because it has

Product $(A)$ is

The product $(A)$ is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module