Question

Define Benzenoid aromatic compounds with one example.

Answer 1

Hint: Benzenoid compounds come under the aromatic compound containing conjugated double bonds and delocalized pi-electrons present in alternate double bond and single bond.

Complete step by step answer:
Aromatic compounds are referred as those compounds which comprises a conjugated planar ring system with delocalized pi-electrons cloud situated at alternate double bond and single bond.
The aromatic compounds are broadly divided usually in two groups.
(1) Benzenoid aromatic compounds
(2) Non-Benzenoid aromatic compounds
Benzenoid aromatic compounds: The benzenoid aromatic compounds are referred to as those compounds which contain only benzene rings in the whole structure. The benzene ring may be one or more than one. Examples of Benzenoid aromatic compounds are benzene-benzene contains a single ring, naphthalene- naphthalene contains two benzene rings.
Non-benzenoid aromatic compounds: The non-benzenoid aromatic compounds are referred to as those compounds which do not contain any benzene ring in their structure. Example Furan- Furan is a five membered ring which contains four carbon atoms and one oxygen atom.
For a compound to be aromatic it should follow Huckel’s rule. The Huckel rule says that for a ring to be aromatic in nature it should follow the given rules shown below.
(1) The ring should be planar
(2) The ring should be complete delocalized by pi-electrons
(3) The compound should possess (4n + 2) \[\pi \] electrons in the ring.

Note:
The benzenoid aromatic compounds have increased stability from resonance in the benzene ring. The aromatic compounds are usually non-polar in nature and non-miscible in water. The non-aromatic compounds lack the Huckel rule properties.