CBSE Class 12 Chemistry Amines Assignment

CBSE Class 12 Chemistry Amines Assignment. Students are advised to refer to the attached assignments and practise them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice.
 
Level one

1) Write IUPAC names of the following compounds and classify them into primary,secondary andteritary amines.
a) (CH3)2CHNH2
Ans:propan-2-amine(primary)
b)CH3(CH2)2NH2
Ans:propan-1-amine(primary)
c)CH3NHCH(CH3)2
Ans:N-Methyl propan-2-amine(secondary)
d)(CH3)3CNH2
Ans:2-Methylpropan-2-amine (primary)
e)C6H5NHCH3
Ans:N-Methylaniline (secondary)
f)m-BrC6H4NH2
Ans:3-Bromobenzenamine(primary)
 
 
2) Give one chemical test to distinguish between the following pairs of compounds.
a) Methylamine and dimethylamine
Ans:Methyl amine being a 1° amine will give carbyl amine test,while dimethylamine,a 2° amine will not give this test.
b)Ethylamine and aniline
Ans:Aniline will give brilliantly coloured orange dye on diazotization and coupling with phenol.
ethylammine on treatment with HNO3(NaOH+HCl) gives N2 and ethanol fails to couple with phenol to give adye
d)Aniline and benzylamine
Ans:Aniline (an aromatic primary amine) will give brilliantly coloured orange dye on diazotization and coupling
with phenol.Benzylamine which is not an aromatic primary amine will not give this test. It only give N2 and benzyl alcohol with HNO2.
e)Aniline and N-methylaniline
Ans: Aniline is a primary amine it will give carbyl amine test while N-methylaniline is a secondary amine,and as such it will not give carbyamine test.
 
 
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