Which of the following is not an aromatic spe | vedclass

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

Question

(A) To determine if a species is aromatic,it must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ electrons

Vedclass · Accepted Answer

Cyclopentadienyl cation $(C_5H_5^+)$

Vedclass · Answer

(A) To determine if a species is aromatic,it must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n+2) \pi$ electrons,where $n$ is an integer $(0, 1, 2, ...)$.$A$. Cyclopentadienyl cation $(C_5H_5^+)$: It has $4 \pi$ electrons (anti-aromatic).$B$. Cyclopentadienyl anion $(C_5H_5^-)$: It has $6 \pi$ electrons $(n=1)$,so it is aromatic.$C$. Cycloheptatrienyl cation $(C_7H_7^+)$: It has $6 \pi$ electrons $(n=1)$,so it is aromatic.$D$. Naphthalene $(C_{10}H_8)$: It has $10 \pi$ electrons $(n=2)$,so it is aromatic.Therefore,the cyclopentadienyl cation is not aromatic.

Which of the following is not an aromatic species?

Similar Questions

The product $(A)$ formed in the following reaction is:

For isomeric hydrocarbons with molecular formula $C_9H_{12}$ that give a negative Baeyer's test,determine the total number of isomers that possess four different non-aliphatic substitution sites.

The major product of the given reaction is:

Hydrogenation of naphthalene $(P)$ with excess hydrogen gas stops cleanly at $1, 2, 3, 4-$ tetrahydronaphthalene $(Q).$ What conclusion can be drawn from this experiment?

The chemical system that is non-aromatic is

Vedclass Test Series

Exam Paper Generator

Online Exam Module