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Organic Chemistry

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Aromatic Compounds

Question
15 out of 16
 

The earliest predictions about the structure of benzene could not completely explain some of its properties. Later it was found that benzene has a cyclic structure which is commonly represented as follows:

image\27771 ch 18 passage 1.png

These two structures are resonance structures of benzene. Benzene is also commonly represented as shown below:

image\27782 ch 18 passage 1.png

A series of reactions were conducted using benzene and other aromatic compounds.

Reaction 1

In Reaction 1, benzene was reacted with n-propyl chloride in the presence of AlCl3.

Reaction 2

Nitrobenzene was reacted with nitric acid and sulfuric acid. The reaction occurred as follows:


image\Ch 18 pass react 2.png


The inscribed circle in the benzene ring represents:

A The carbon chain in the cyclic ring
B The sigma-system of electrons
C The pi-system of electrons
D The eight pi-electrons in the cyclic system
Ans. C The inscribed circle stands for the pi-system of electrons present in the benzene ring. Let's be more precise: The circle represents the 6 pi electrons of the benzene ring. Choice D states "8 pi-electrons" which is wrong.

Aromatic Compounds Flashcard List

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