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Chemistry Class - 11: Chapter โ 13. Hydrocarbons Part โ 6
Question: 37
The ring systems having following characteristics are aromatic.
(i) Planar ring containing conjugated bonds.
(ii) Complete delocalisation of the ฯ โ electrons in ring system i.e.. each atom in the ring has unhybridised p-orbital, and
(iii) Presence of electrons in the ring where n is an integer .
Using this information classify the following compounds as aromatic/nonaromatic
(A)
(B)
(C)
(D)
(E)
(F)
(G)
Answer:
Planar ring, all atoms of the ring hybridised, has six delocalised electrons, follows Huckel rule. It is aromatic.
B six electrons, but the delocalisation stops at hybridised carbon. Hence, not aromatic
Six delocalised electrons unshared electrons on negatively charged carbon) in a planar ring, follows Huckelีs rule. It is aromatic.
Has only four delocalised electrons. It is non aromatic.
Six delocalised electrons follows Huckelีs rule. electrons are in hybridised orbitals, conjugation all over the ring because of positively charged carbon. The ring is planar hence is aromatic.
Follows Huckelีs rule, has electrons i.e.. electrons where , delocalised electrons. It is aromatic.
electrons, does not follow Huckelีs rule i.e.. , electrons rule. It is not aromatic.