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Chapter 17: Q.31. (page 641)

Question: Which compounds are aromatic? For any compound that is not aromatic, state why this is so.

Short Answer

Expert verified

Answer

a.

Not aromatic in nature

b.

Not an aromatic compound

c.

Non-aromatic compound

d.

Non-aromatic compound

Step by step solution

01

Aromatic compounds

The compounds which fulfil all of the following conditions are aromatic in nature:

  • The compounds which are cyclic.
  • The compounds which are planar.
  • The compounds which are conjugated with 4n+2πelectrons.

The compound which is aromatic in nature is always more stable than the corresponding acyclic compound with the same number of πelectrons.

02

The aromatic compounds among the given compounds

a. In the following compound, the marked carbon atoms are not sp2hybridized. They are not completely conjugated. This compound is not aromatic.

Not aromatic in nature

b. The circled carbon atom is not sp2hybridized. These are not completely conjugated. This compound is not aromatic in nature.

Not an aromatic compound

c. This compound has 12πelectrons. It does not have 4n+2πelectrons. Therefore, this compound is not aromatic in nature.

Non-aromatic compound

d. This compound has 12πelectrons and is not aromatic. It does not have 4n+2πelectrons.

Non-aromatic compound

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