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

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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