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प्रश्न
Write a short note on the following.
Coupling reaction
उत्तर
Benzene diazonium chloride reacts with electron-rich aromatic compounds like phenol, aniline to form brightly coloured azo compounds. Coupling generally occurs at the para position. If para position is occupied then coupling occurs at the ortho position. Coupling tendency is enhanced if an electron-donating group is present at the para-position to \[\ce{-\overset{+}{N2}Cl^-}\] group. This is an electrophilic substitution.
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संबंधित प्रश्न
The conversion of primary aromatic amines into diazonium salts is known as ___________
Write a short note on diazotisation.
Product ‘P’ in the above reaction is:
The major product of the following reaction:
Write a short note on the following.
Gomberg reaction
Account for the following.
Diazonium salts of aromatic amines are more stable than those of aliphatic amines.
A dibromo derivative (A) on treatment with KCN followed by acid hydrolysis and heating gives a monobasic acid (B) along with the liberation of CO2. (B) on heating with liquid ammonia followed by treating with Br2/KOH gives (C) which on treating with NaNO2 and HCl at low temperature followed by oxidation gives a monobasic acid (D) having molecular mass 74. Identify A to D.
What would be the major product of the following reaction?
\[\ce{C6H5 - CH2 - OC6H5 + HBr -> A + B}\]
Coupling of benzene diazonium chloride with 1-naphthol in alkaline medium will give:
The major product of the following reaction is:
