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Benzne reacts with sulphuric acid to form benzenesulphonic acid, only when the sulphuric acid is

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Benzne reacts with sulphuric acid to form benzenesulphonic acid, only when the sulphuric acid is
A. cold and dilute
B. hot and dilute
C. hot and concentrated
D. mixed with `HNO_(3)`
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Correct Answer - C
Sulphonation of benzene is usually carried out with fuming sulphuric acid at room temperature sulphonation also takes place in concentrated `H_(2)SO_(4)` but more slowly thus we must use hot and conc. `H_(2)SO_(4)`.
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