show the mechanistic steps involved in nitration of benzene
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✔️✔️ MECHANISMS OF NITTRATION OF BENZENE ✔️✔️
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Answer:-
Benzene is treated with a mixture of concentrated nitric acid and concentrated sulfuric acid at a temperature not exceeding 50°C. As temperature increases there is a greater chance of getting more than one nitro group, -NO2, substituted onto the ring. Nitrobenzene is formed:
C6H6+HNO3→C6H5NO2+H2O(1)
or:
The concentrated sulfuric acid is acting as a catalyst.
The formation of the electrophile
The electrophile is the "nitronium ion" or the "nitryl cation", NO+2 . This is formed by reaction between the nitric acid and the sulphuric acid.
HNO3+2H2SO4→NO+22HSO−4+H3O+(2)
The electrophilic substitution mechanism
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