Which of the four structures $(a)$ to $(d)$ given are aromatic?

a and d

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b and c

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a and b

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a and c

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Solution

The correct option is B a and c
Aromaticity depends on 3 factors:
1. planarity of the molecule.
2. The molecules must be fully conjugated.
3. The molecules must follow Huckel's rule (4n+2 pi electrons).
The cyclopropene cation in option A is aromatic as it is planar molecule and has $s p^{2}$ hybridized carbon atoms along with 2 $π$ electrons.
Similarly, the compound in option C i.e. Biphenyl is also aromatic as it follows all the criteria required for aromaticity.

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