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प्रश्न
Give one chemical test to distinguish between the following pair of compounds.
Methylamine and dimethylamine
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उत्तर
Methylamine and dimethylamine can be distinguished by the carbylamine test.
Carbylamine test: Aliphatic and aromatic primary amines on heating with chloroform and ethanolic potassium hydroxide form foul-smelling isocyanides or carbylamines. Methylamine (being an aliphatic primary amine) gives a positive carbylamine test, but dimethylamine does not.
\[\ce{\underset{Methylamine (1^\circ)}{CH3 - NH2} + CHCl3 + 3KOH ->[\Delta] \underset{(foul smell)}{\underset{Methyl isocyanide}{CH3 - NC}} + 3KCl + 3H2O}\]
\[\ce{\underset{Dimethylamine}{(CH3CH2)2NH} ->[CHCl3/KOH (alc.)][Heat] No reaction}\]
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संबंधित प्रश्न
Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.
(CH3)2CHNH2
Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.
(CH3CH2)2NCH3
Give one chemical test to distinguish between the following pair of compounds.
Aniline and benzylamine
Give one chemical test to distinguish between the following pair of compounds.
Aniline and N-methylaniline
Account for the following:
Ethylamine is soluble in water, whereas aniline is not.
Account for the following:
Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.
How will you convert ethanoic acid into propanoic acid?
Accomplish the following conversion:
Benzoic acid to aniline
Accomplish the following conversion:
Chlorobenzene to p-chloroaniline
An aromatic compound ‘A’ on treatment with aqueous ammonia and heating forms compound ‘B’ which on heating with Br2 and KOH forms a compound ‘C’ of molecular formula C6H7N. Write the structures and IUPAC names of compounds A, B and C.
Complete the following reaction:
\[\ce{C6H5NH2 + Br2 (aq) ->}\]
Complete the following reaction:
\[\ce{C6H5NH2 + (CH3CO)2O ->}\]
Complete the following reaction:
\[\ce{C6H5N2Cl ->[(i) HBF4][(ii) NaNO2/Cu, \Delta]}\]
Do the following conversions in not more than two steps :
Ethyl benzene to Benzoic acid
Using IUPAC norms, write the formula of Hexaamminecobalt(III) sulphate.
An organic compound (A) with molecular formula C3H7NO on heating with Br2 and KOH forms a compound (B). Compound (B) on heating with CHCl3 and alcoholic KOH produces a foul-smelling compound (C) and on reacting with C6H5SO2Cl forms a compound (D) which is soluble in alkali. Write the structure of (A), (B), (C) and (D).
Predict the product 'A' in the following reaction.
\[\ce{\underset{(Acetyl chloride)}{CH3COCl}->[H2][Pd-BaSO4]A + HCl}\]
