Identify the number of aromatic compounds fro | vedclass

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

Question

(A) To determine aromaticity,a compound must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$(i)$ $1,2,4$-triaz

Vedclass · Accepted Answer

$4$

Vedclass · Answer

(A) To determine aromaticity,a compound must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$(i)$ $1,2,4$-triazole: Planar,cyclic,$6$ $\pi$ electrons ($4$ from double bonds,$2$ from lone pair on $N$ at position $1$). Aromatic.(ii) $2$-pyrone: The oxygen atom is $sp^3$ hybridized at the carbonyl position,breaking conjugation. Non-aromatic.(iii) Benzimidazole: Planar,cyclic,$10$ $\pi$ electrons. Aromatic.(iv) Pyrazole: Planar,cyclic,$6$ $\pi$ electrons. Aromatic.$(v)$ Cyclooctatetraene dianion: Planar,cyclic,$10$ $\pi$ electrons. Aromatic.(vi) Pyrrolidinium cation: The nitrogen is $sp^3$ hybridized,breaking conjugation. Non-aromatic.(vii) Cyclopentadienyl cation: Planar,cyclic,$4$ $\pi$ electrons ($4n$ rule). Anti-aromatic.Thus,the aromatic compounds are $(i)$,(iii),(iv),and $(v)$. The total number is $4$.

Identify the number of aromatic compounds from the following structures:
$(i)$ $1,2,4$-triazole
(ii) $2$-pyrone
(iii) Benzimidazole
(iv) Pyrazole
$(v)$ Cyclooctatetraene dianion
(vi) Pyrrolidinium cation
(vii) Cyclopentadienyl cation

Similar Questions

Identify the number of aromatic compounds from the following structures:
$(I)$ Cyclopentadiene
$(II)$ Cyclooctatetraene
$(III)$ Borazine $(B_3N_3H_6)$
$(IV)$ $1,4-$diboracyclohexa$-2,5-$diene

For the electrophilic aromatic substitution reaction on the benzene ring,the substituents are $-CH_3$,$-CH_2Cl$,$-CHCl_2$,and $-CCl_3$. What is the increasing order of reactivity towards electrophilic substitution?

Which of the following groups,when attached to a benzene ring,acts as a deactivating meta-directing group?

Identify the position where $E.A.S.$ (Electrophilic Aromatic Substitution) will take place.

The common name of isopropyl benzene is

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Identify the number of aromatic compounds from the following structures:$(i)$ $1,2,4$-triazole(ii) $2$-pyrone(iii) Benzimidazole(iv) Pyrazole$(v)$ Cyclooctatetraene dianion(vi) Pyrrolidinium cation(vii) Cyclopentadienyl cation