Advertisements
Advertisements
Question
Give one chemical test to distinguish between the following pair of compounds.
Aniline and benzylamine
Advertisements
Solution
Aniline and benzylamine can be distinguished by their reactions with the help of nitrous acid, which is prepared in situ from a mineral acid and sodium nitrite. Benzylamine reacts with nitrous acid to form unstable diazonium salt, which in turn gives alcohol with the evolution of nitrogen gas.
\[\ce{\underset{Benzylamine}{C6H5CH2 - NH2} + HNO2 ->[NaNO2 + HCl] \underset{(Unstable)}{[C6H5CH2 - \overset{+}{N2}C\overset{-}{l}]} ->[H2O] N2 ^ + \underset{Benzy alcohol}{C6H5CH2 - OH} + HCl}\]
On the other hand, aniline reacts with HNO2 at a low temperature to form stable diazonium salt. Thus, nitrogen gas is not evolved.
\[\ce{C6H5NH2 ->[NaNO2 + HCl][273 - 278 K] C6H5 - \overset{+}{N2}C\overset{-}{l} + NaCl + 2H2O}\]
APPEARS IN
RELATED QUESTIONS
Convert 3-Methylaniline into 3-nitrotoluene.
Convert aniline into 1, 3, 5-tribromobenzene.
Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.
CH3NHCH(CH3)2
Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.
C6H5NHCH3
Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.
m−BrC6H4NH2
Give one chemical test to distinguish between the following pair of compounds.
Methylamine and dimethylamine
How will you convert hexanenitrile into 1-aminopentane?
How will you convert ethanamine into methanamine?
How will you convert nitromethane into dimethylamine?
How will you convert propanoic acid into ethanoic acid?
Accomplish the following conversion:
Benzoic acid to aniline
Accomplish the following conversion:
Chlorobenzene to p-chloroaniline
Complete the following reaction:
\[\ce{C6H5NH2 + H2SO4 (conc.)}\]
Write the structure of 2,4-dinitrochlorobenzene
What is the action of p-toluenesulphonychloride on ethylamine and diethylamine?
Identify the incorrect IUPAC name.
Do the following conversions in not more than two steps:
