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.
$\mathrm{C}_3 \mathrm{H}_8$ 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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