EXPLAIN THE RULES FOR DETERMINATION OF AROMATIC CHARACTER OF ANY ORGANIC COMPOUNDS WITH ANY SUITABLE EXAMPLE

Asked by roopali mishra | 22nd Feb, 2014, 09:19: PM

Expert Answer:

If the compound does not meet all the following criteria, it is likely not aromatic.

  1. The molecule is cyclic (a ring of atoms)
  2. The molecule is planar (all atoms in the molecule lie in the same plane)
  3. The molecule is fully conjugated (p orbitals at every atom in the ring)
  4. The molecule has 4n+2 π electrons (n=0 or any positive integer)

 

                Benzene

Example:

Characteristics of benzene:

(i)                It is cyclic and planar.

(ii)              It exhibits continuous delocalisation. All the carbons of cyclic system are sp2 hybridised and thus p orbitals are available for delocalisation.

(iii)            It obeys Huckel’s rule, as the number of delocalised P electrons is six.

(iv)            Thus benzene is aromatic as all the conditions are satisfied.

Answered by  | 25th Feb, 2014, 11:49: AM

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