Distinguish between the following pair of compounds(i) Aniline and Ben

1.	Distinguish between the following pair of compounds(i) Aniline and Benzylamine(ii) Methylamine and Dimethylamine.(b)CoCompleteCHCHCN , ent-A-0cmoCH,CH.CN-Lidma → A-n°С
Answer» 1. (i) Benzyl amine being a primary amine will form an unstable diazonium salt which decomposes to benzyl alcohol and nitrogen gas. Aniline forms a stable diazonium salt with acidic sodium nitrite which further reacts with napthol to give a red dye.(ii) Methylamine and dimethylamine can easily be distinguished by carbylamine test.Carbylamine test: Aliphatic and aromatic primary amines on heating with chloroform (CHCl3) and ethanolic potassium hydroxide (KOH/ETOH)form isocyanides or carbylamines. Methylamine, being an aliphatic primary amine, gives a positive carbylamine test, but dimethyl amine, being a secondary amine does not. 2. A = CH3.CH2.CH2.NH2 B = CH3CH2CH2OH + H2O + N2

Distinguish between the following pair of compounds(i) Aniline and Benzylamine(ii) Methylamine and Dimethylamine.(b)CoCompleteCHCHCN , ent-A-0cmoCH,CH.CN-Lidma → A-n°С

Answer»

1. (i) Benzyl amine being a primary amine will form an unstable diazonium salt which decomposes to benzyl alcohol and nitrogen gas. Aniline forms a stable diazonium salt with acidic sodium nitrite which further reacts with napthol to give a red dye.(ii) Methylamine and dimethylamine can easily be distinguished by carbylamine test.Carbylamine test: Aliphatic and aromatic primary amines on heating with chloroform (CHCl3) and ethanolic potassium hydroxide (KOH/ETOH)form isocyanides or carbylamines. Methylamine, being an aliphatic primary amine, gives a positive carbylamine test, but dimethyl amine, being a secondary amine does not.

2. A = CH3.CH2.CH2.NH2 B = CH3CH2CH2OH + H2O + N2

Discussion

No Comment Found

Related InterviewSolutions

ne Henry's law and give its two applications
25. When 2 gm of a gas A is introduced into an evaluated flaskkept at 25Â°C, the pressure is found to be one atmosphere. If3 gm of another gas B is then added to the same flask, thetotal pressure becomes 1.5 atm. Assuming ideal gasbehaviour, calculate the ratio of the molecular weightsA.B
3.Write any two applications of osmotic pres
8.What are the harmful effects of plastics especially plastic bags?
8. What are the harmful effects of plastics especially plastic bags?
14. In a group of 50 persons, 14 drink tea but not coffee and 30 drink tea. Find ((0) Hormany drink tea and coffee both () How many drink coffee but not tea.
Write the mechanisms and applications(a) Mannich reaction
Why Solids, Liquids and Gases Have Different Properties
the galvanised article is protected against rusting even if the zinc coating is broken . reason this out???
How glass wool is prepared ? Give itsapplications based on two different properties.(Ans. : Refer Section 3.3.3)