Target Practice – Amines (20 Marks)
You are expected to write the answer completely in a paragraph. Key is given just for your guidelines.
Show your answer to the Faculty and get his approval.
1) Classify (CH
3)
2NH. (2)
Ans: 2° amine.
2) Name the test distinguishing 1°,2°,3° amines. (2)
Ans: Hinsberg test.
3) Which amines give carbylamine reaction? (2)
Ans: Only 1° amines.
4) Arrange basicity (aqueous): CH
3NH
2, (CH
3)
2NH, (CH
3)
3N. (2)
Ans: 2° > 3° > 1°.
5) Why aniline is weaker base than NH
3? (2)
Ans: Lone pair delocalisation into ring.
6) Reagent for Hofmann bromamide degradation. (2)
Ans: Br2/KOH.
7) Product of aliphatic 1° amine with HNO
2. (2)
Ans: Alcohol + N2.
8) What is ortho effect? (2)
Ans: o-Substituted anilines weaker bases than aniline.
9) Which synthesis gives pure 1° aliphatic amines? (2)
Ans: Gabriel synthesis.
10) Colour formed in azo coupling? (2)
Ans: Orange/yellow azo dyes.