MCQ
Which of the following is aromatic compound


- ✓$I, \,II$ and $IV$
- B$II, \,III$ and $IV$
- C$I,\, II,\, III$
- DAll compounds are aromatic

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| Period number | Group number | |
| $P$ | $2$ | $15$ |
| $Q$ | $3$ | $2$ |
Then formula of the compound formed by $P$ and $Q$ element is