Which of the following structures are aromati | vedclass

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

Question

(B) compound is aromatic if it is cyclic,planar,fully conjugated,and follows $H$ückel's rule ($4n+2$ $\pi$ electrons).$A$ (Cyclopentadienyl anion): It

Vedclass · Accepted Answer

Only $A$ and $B$

Vedclass · Answer

(B) compound is aromatic if it is cyclic,planar,fully conjugated,and follows $H$ückel's rule ($4n+2$ $\pi$ electrons).$A$ (Cyclopentadienyl anion): It has $6$ $\pi$ electrons ($4$ from double bonds + $2$ from the lone pair on the $sp^3$ carbon,which becomes $sp^2$ due to conjugation). It is cyclic,planar,and aromatic.$B$ (Tropylium cation): It has $6$ $\pi$ electrons. It is cyclic,planar,and aromatic.$C$ (Cyclooctatetraene derivative): It is non-planar (tub-shaped) to avoid anti-aromaticity,hence it is non-aromatic.$D$ (Cycloheptatrienyl anion): It has $8$ $\pi$ electrons ($4n$ system),making it anti-aromatic.Therefore,only $A$ and $B$ are aromatic.

Which of the following structures are aromatic in nature?

Similar Questions

The total number of compounds from the list below that,when treated with hot $KMnO_4$,yield benzoic acid is:

Benzene on treatment with a mixture of conc. $HNO_3$ and conc. $H_2SO_4$ at $90^\circ C$ gives :

Identify the correct method for the synthesis of the compound shown below from the following alternatives.

Benzene hexachloride is prepared from benzene and chlorine in the presence of sunlight by:

Credit for the ring structure of benzene goes to

Vedclass Test Series

Exam Paper Generator

Online Exam Module