pyridine
Aniline
The Kjeldahl's method cannot be applied to pyridine.
Explanation:
Kjeldahl's method is a widely used technique for the estimation of nitrogen in organic compounds. However, it cannot be applied to pyridine because pyridine is a basic compound and can react with the strong acids used in the Kjeldahl method, interfering with the process. The method works by converting the nitrogen into ammonium salt, but pyridine forms pyridinium salts, which prevent the complete conversion of nitrogen. Therefore, the presence of pyridine would lead to inaccurate results.
Which of the following amines does not give foul smell of isocyanide on heating with chloroform and ethanolic KOH ?
Amines are usually formed from amides, imides, halides, nitro compounds, etc. They exhibit hydrogen bonding which influences their physical properties. In alkyl amines, a combination of electron releasing, steric and H-bonding factors influence the stability of the substituted ammonium cations in protic polar solvents and thus affect the basic nature of amines. Alkyl amines are found to be stronger bases than ammonia. Amines being basic in nature, react with acids to form salts. Aryldiazonium salts, undergo replacement of the diazonium group with a variety of nucleophiles to produce aryl halides, cyanides, phenols and arenes.