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Benzene reacts with concentrated sulphuric acid (slowly) or fuming sulphuric acid (more quickly) to form benzene sulphonic acid. The electrophile is sulphur trioxide.
a) Explain the source of the sulphur trioxide if you are using(i) concentrated sulphuric acid(ii) fuming sulphuric acid.
b) Explain why sulphur trioxide is an electrophile.c) Give the full mechanism for the reaction
Verified Expert
The whole theory is based on principle of electrophilic aeromatic substituion. Which consists in two parts 1) sulphonation 2) Nitration Sulphonation itself divided into three parts a) Regents b) Intermediate 3) final product So, generation of regents depends upon the type of H2SO4 generally we use fuming sulphuric acid which generate more SO3 during desoociation. due to slight positive charge on sulphur, benzne electron attacks on the sulphur and after substituion of hydrogen bond we get the desired compound.
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