Which of the following is Aromatic Hydrocarbon? - Vidyadip

MCQ

Which of the following is Aromatic Hydrocarbon?

A
$ \mathrm{C}_2 \mathrm{H}_2$
B
$ \mathrm{C}_3 \mathrm{H}_8 $
C
$ \mathrm{C}_5 \mathrm{H}_{12} $
✓
$ \mathrm{C}_6 \mathrm{H}_6$

✓

Answer

Correct option: D.

$ \mathrm{C}_6 \mathrm{H}_6$

$\mathrm{C}_2 \mathrm{H}_2$ is called acetylene. It is an aliphatic alkyne. So it is not aromatic.
$\mathrm{C}_3 \mathrm{H}_8$ is called propane. It is a simple alkane. So, it is not aromatic.
$\mathrm{C}_5 \mathrm{H}_{12}$ is called pentane. It is a simple alkane. So, It is also not aromatic.
$\mathrm{C}_6 \mathrm{H}_6$ is a cyclic, planar, and has a complete conjugated system.
Also, it has $6 \pi$ electrons. Hence it follows Huckel's rule.Therefore, it is aromatic.

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