Chemistry Class-11: Chapter –13. Hydrocarbons Part – 6

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Question: 37

The ring systems having following characteristics are aromatic.

(i) Planar ring containing conjugated bonds.

(ii) Complete delocalisation of the π−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)

compounds as aromatic/nonaromatic

Structure of Compound

compounds as aromatic/nonaromatic

(B)

compounds as aromatic/nonaromatic

Structure of Compound

compounds as aromatic/nonaromatic

(C)

compounds as aromatic/nonaromatic

Structure of Compound

compounds as aromatic/nonaromatic

(D)

compounds as aromatic/nonaromatic

Structure of Compound

compounds as aromatic/nonaromatic

(E)

compounds as aromatic/nonaromatic

Structure of Compound

compounds as aromatic/nonaromatic

(F)

compounds as aromatic/nonaromatic

Structure of Compound

compounds as aromatic/nonaromatic

(G)

compounds as aromatic/nonaromatic

Structure of Compound

compounds as aromatic/nonaromatic

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 Huckel’s rule. It is aromatic.

Has only four delocalised electrons. It is non aromatic.

Six delocalised electrons follows Huckel’s rule. electrons are in hybridised orbitals, conjugation all over the ring because of positively charged carbon. The ring is planar hence is aromatic.

Follows Huckel’s rule, has electrons i.e. electrons where , delocalised electrons. It is aromatic.

electrons, does not follow Huckel’s rule i.e., electrons rule. It is not aromatic.

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