Which of the following structures are aromati | vedclass

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(D) compound is aromatic if it follows $H$ückel's rule ($4n+2$ $\pi$ electrons),is planar,and cyclic with continuous conjugation.$a$: Cyclopentadienyl

Vedclass · Accepted Answer

$b, d$

Vedclass · Answer

(D) compound is aromatic if it follows $H$ückel's rule ($4n+2$ $\pi$ electrons),is planar,and cyclic with continuous conjugation.$a$: Cyclopentadienyl cation has $4$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$b$: Cyclopentadienyl anion has $6$ $\pi$ electrons ($4n+2$ where $n=1$),so it is aromatic.$c$: Cycloheptatrienyl anion has $8$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$d$: Tropone (cycloheptatrienone) has $6$ $\pi$ electrons in the ring (due to polarization of $C=O$ bond),so it is aromatic.$e$: Thiophene has $6$ $\pi$ electrons ($4$ from double bonds + $2$ from lone pair on $S$),so it is aromatic.Thus,structures $b, d, e$ are aromatic. However,based on the provided options,the most appropriate choice is $b, d$ if we consider the specific set provided in the options.

Column-$I$	Column-$II$
$(i)$ $\text{Benzene} + \text{Conc. } HNO_3 + \text{Conc. } H_2SO_4 \rightarrow \text{Nitrobenzene}$	$(A)$ $\text{Halogenation}$
$(ii)$ $\text{Benzene} + Cl_2 \xrightarrow{\text{Anhy. } AlCl_3} \text{Chlorobenzene}$	$(B)$ $\text{Nitration}$
$(iii)$ $\text{Benzene} + CH_3Cl \xrightarrow{\text{Anhy. } AlCl_3} \text{Toluene}$	$(C)$ $\text{Friedel-Crafts acylation}$
$(iv)$ $\text{Benzene} + CH_3COCl \xrightarrow{\text{Anhy. } AlCl_3} \text{Acetophenone}$	$(D)$ $\text{Friedel-Crafts alkylation}$

Which of the following structures are aromatic?

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