AIM – To test the presence of amine in the given organic compound.
Procedure:-
| Experiment | Observation | Inference |
| LITMUS TEST
Organic compound + few drops of red litmus solution. |
Red litmus turns blue | Amino group present. |
| SOLUBILITY TEST
Organic compound + 1-2 ml of diluted HCl. Shake well. |
Organic compound dissolves. | Amino group present |
| CARBYLAMINE TEST
Organic compound + CHCl3 + Alc.KOH. Heat |
An obnoxious smell is obtained. | Primary amine present. |
| AZO DYE TEST
Dissolve organic compound in diluted HCl and cool in ice. Add ice cold NaNO2 solution to it. Mix well. Add ice cold solution of β- naphthol + NaOH. |
A red or orange dye is obtained. | Primary aromatic amino group present. |
Chemical Equations:-
1. R-NH2 + HCl → R- NH3+Cl–
amine amine salt
2. R-NH2 + CHCl3 + 3KOH → R- N≡ C + 3KCl + 3H2O
Isocyanide or Carbylamine
3. NaNO2 + HCl → HNO2 + NaCl
4. ArNH2 + HNO2 + HCl → Ar- N+≡ N–Cl + 2H2O
Aromatic Aryldiazonium chloride
10 amine (stable between 0- 50C)
β- naphthol (draw structure) + Ar- N+≡ N–Cl → (draw structure of the azo dye obtained) + NaCl + H2O
RESULT: : (ON RULED SIDE ) Amino present in the given organic compound.
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