Which of the following is aromatic?

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(D) For a compound to be aromatic,it must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,and have a continuous cyclic conjugation.$(A)$ Cyc

Vedclass · Accepted Answer

Cycloheptatrienyl cation

Vedclass · Answer

(D) For a compound to be aromatic,it must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,and have a continuous cyclic conjugation.$(A)$ Cyclopentadienyl cation has $4$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$(B)$ Cyclobutadiene has $4$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$(C)$ Cycloheptatriene is non-planar due to the $sp^3$ hybridized carbon atom,so it is non-aromatic.$(D)$ Cycloheptatrienyl cation (tropylium ion) has $6$ $\pi$ electrons ($4n+2$ where $n=1$),is planar,and fully conjugated,making it aromatic.

Similar Questions

$x =$ Number of aromatic compounds obtained when the above compound undergoes complete acidic hydrolysis.

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

Assertion : Nitrating mixture used for carrying out nitration of benzene consists of conc. $HNO_3 +$ conc. $H_2SO_4$.
Reason : In presence of $H_2SO_4$,$HNO_3$ acts as a base and produces $NO_2^+$ ions.

The cyclopentadienyl anion is:

Which of the following groups have an activating effect on the benzene ring?
$-OH, -COCH_3, -NO_2, -NH_2, -Cl, -Br, -NHCOCH_3, -COOH$

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