First slide

Arenes

Question

Which is aromatic species?

Moderate

A

Benzene
B

Cyclo octa tetraene
C

Butene - 1
D

Propane

Solution

[Step 1]:
Conditions for aromaticity
i) Planar conjugated
ii) Cyclic
iii) Obey’s Huckel’s rule
i.e (4n+2)πe-
[Step 2]:
Option (1) Benzene
is planar conjugated, cyclic and contains 6πe-.
Therefore it is an aromatic compound
[Step 3]:
Option (2)
is not obeys Huckel’s rule
[Step 4]:
Option (3) Butene-1 ${CH}_{3} - {CH}_{2} - CH = {CH}_{2}$ and
Option (4) ${CH}_{3} {CH}_{2} {CH}_{3}$ are not a cyclic compound.

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