MCQ
Identify the polynuclear aromatic compound which is aromatic
- A$(i)$ and $(ii)$
- B$(ii)$ and $(iii)$
- ✓$(i)$, $(ii)$ and $(iii)$
- D$(i)$ and $(iii)$
✓
Answer
Correct option: C.
$(i)$, $(ii)$ and $(iii)$
c
For any compound to be aromatic, all carbon atoms must be $sp ^2$ hybridised and must follow Huckle rule.
For any compound to be aromatic, all carbon atoms must be $sp ^2$ hybridised and must follow Huckle rule.
Huckel's Rule $\Rightarrow 4 n +2=$ no. of delocalised $\pi$-electrons $( n =0,1,2,3 \ldots)$
$(i) \,4 n +2=10 \Rightarrow n =2$
$(ii) \,4 n +2=14 \Rightarrow n =3$
$(iii)\,4 n +2=14 \Rightarrow n =3$
All compounds follow Huckel's rule, thus all are aromatic compounds.
Hence, the correct answer is option $C$.
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