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    <pre style="white-space:pre-line"><code>9. Aromatic Hydrocarbons      eLearn.Punjab

3. Sulphonation

The introduction of sulphonic acid group in benzene ring is
called Sulphonation. When benzene is heated with fuming
H2SO4 or conc. H2SO4 it yields benzene sulphonic acid.

  Mechanism:

When sulphuric acid alone is used, the actual electrophile in this
reaction is SO3.

                          25</code></pre>
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