# Reactions of Aromatic Compounds - Examples of Ar-SE Reaction

## Exercises: Sulfonation

Instruction : Exercise 1

Fig.1

Instruction : Exercise 2

Fig.2

Exercise

When benzene is treated with hot concentrated sulfuric acid for a certain period of time, ...

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 ... benzenesulfatic acid is formed. ... benzenesulfinic acid is formed. ... benzenesulfonic acid is formed.
Exercise

When oleum, instead of concentrated sulfuric acid, is applied sulfonation of aromatic compounds ...

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 ... runs considerably more rapid with increasing $SO3$ concentration . ... runs considerably more rapid with decreasing $SO3$ concentration . ... runs considerably more slowly with increasing $SO3$ concentration .
Exercise

Sulfonation is, ...

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 ... in contrast to nitration, irreversible. ... like nitration, reversible. ... in contrast to nitration, reversible.
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