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प्रश्न
Give reasons for the following:
Aniline does not undergo Friedel- Crafts reaction.
Account for the following:
Aniline does not undergo Friedel-Crafts reaction.
Why aniline does not undergo Friedel-Crafts reaction?
उत्तर १
Aniline does not undergo Friedel-Crafts reaction:
A Friedel-Crafts reaction is carried out in the presence of AlCl3. But AlCl3 is acidic in nature, while aniline is a strong base. Thus, aniline reacts with AlCl3 to form a salt (as shown in the following equation).
Due to the positive charge on the N-atom, electrophilic substitution in the benzene ring is deactivated. Hence, aniline does not undergo the Friedel-Crafts reaction.
उत्तर २
AlCl3 is acidic and aniline is basic in nature. They react with each other to form a salt. As a result, a positive charge is developed on the N-atom and electrophilic substitution in the benzene ring is deactivated. Hence, aniline does not undergo Friedel-Crafts reaction.
\[\ce{C6H5NH2 + AlCl3 -> C6H5NH^{+}2 AlCl^{-}3}\]
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संबंधित प्रश्न
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Hot and conc. sulphuric acid
How will you convert the following?
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