Question

# Which of these species is/are aromatic?  I onlyII onlyIII onlyBoth II and III

Solution

## The correct option is D Both II and IIIBoth II and III follow Huckle's rule of (4n+2) delocalised pi electrons for n = 0 and n = 1 respectively, while in the first structure there are only 4 pi electrons. Thus structure Iis not aromatic.

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