Identify the polynuclear aromatic compound which is aromatic - Vidyadip

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.

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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