Four structures are given in options (i) to (iv). Examine them and select the aromatic structures.

(i)

 

(ii)

(iii)

(iv)

 

Answers (1)

The answer is the option (i) & (iii)

 

Explanation: The following conditions should be fulfilled by a compound in order to become aromatic-

  • \pi electrons in the ring should be completely delocalised.
  • Planarity
  • Huckel Rule should be followed, viz., presence of (4n + 2) \pi electrons in the ring.

Now, analysing the given options:

(i)                + n = 0, planar,

                                        \pi electrons = 2

(ii)         \pi electrons = 8, not planar,

                                        n = not an integer

(iii)                    planar

                                                                \pielectrons = (4n + 2) = 6 in each ring

(iv)              lone pair is not in conjugation, hence it is non aromatic 

                                        n = not an integer

Hence, option (i) and (iii) are aromatic structure.

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