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Chapter 17: Q.20. (page 641)

Question: Use the inscribed polygon method to show why the following cation is aromatic.

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01

Cyclopropenyl cation

Cyclopropenyl cation consists of two $π$ electrons and is planar. So, it obeys Huckel’s rule of aromaticity for $(4 n + 2) π$ electrons, where $n = 0$ .

02

Inscribed polygon method

The inscribed polygon method can be used to find whether a compound is aromatic or not.

03

To show why cyclopropenyl cation is aromatic

In using the inscribed polygon method, always draw the vertex pointing downward.

$2 π$ electrons are present, and all the bonding molecular orbitals are filled. So, it is aromatic.

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Most popular questions from this chapter

Question: Compounds A and B are both hydrogenated to methylcyclohexane. Which compound has the larger heat of hydrogenation? Which compound is more stable?

Question: Draw the four resonance structures for anthracene.

Question: How many electrons are contained in each molecule?

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

Question: Explain the observed rate of reactivity of the following $2 °$ alkyl halides in an $S_{N} 1$ reaction.

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