The Kjeldahl' s method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
The Correct Option is C
Solution and Explanation
The Kjeldahl's method is a widely used technique for estimating the amount of nitrogen present in organic compounds. It is particularly effective for compounds containing nitrogen in the form of amines or ammonia, typically bound within organic structures. Let's analyze the given options to determine which compound is suitable for nitrogen estimation using the Kjeldahl method.
1. In the Kjeldahl procedure, the nitrogen in the organic compound is converted into ammonium sulfate by digestion with concentrated sulfuric acid.
2. The Kjeldahl method is effective for compounds where nitrogen does not exist as nitro (-NO2), azo (-N=N-), nitroso (-NO), or within any other complex derivative of nitrogen.
| Options | Conclusion |
|---|---|
| 1. | Nitroglycerin contains nitrogen as nitro groups, unsuitable for Kjeldahl. |
| 2. | Thiourea has nitrogen in a form suitable for Kjeldahl method. |
| 3. | The compound contains nitrogen in a non-complex form suitable for Kjeldahl. |
| 4. | Azobenzene has nitrogen as azo groups, unsuitable for Kjeldahl. |
Based on the evaluation of these compounds, the compound represented by can be estimated using the Kjeldahl method as it contains nitrogen in a simple form. This validates the selection of the third option as the compound suitable for nitrogen estimation via the Kjeldahl method.
Top Questions on Amines
- Give plausible explanation for each of the following:
Amides are less basic than amines. 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.
How can you convert the following:
(i) Ethanoic acid to methanamine- Give the structures of A, B, and C in the following reaction sequences: (i)\; \(\mathrm{CH_3CH_2I} \xrightarrow[\ ]{\mathrm{NaCN}} A \xrightarrow[\ ]{\;\;HO^-\;/\;H_2O\;\;} B \xrightarrow[\;Br_2/NaOH\;]{} C\)
(ii)\; \(\mathrm{C_6H_5N_2^+Cl^-} \xrightarrow[\ ]{\mathrm{CuCN}} A \xrightarrow[\ ]{\;H_3O^+\;} B \xrightarrow[\ \Delta\ ]{\;NH_3\;} C\)
(iii)\; \(\mathrm{CH_3CH_2Br} \xrightarrow[\ ]{\mathrm{KCN}} A \xrightarrow[\ ]{\mathrm{LiAlH_4}} B \xrightarrow[\;273\,K\;]{\;HNO_2\;} C\) - How can you obtain the following?
(a) Aniline from ammonium benzoate
(b) Benzene diazonium chloride from nitrobenzene
(c) 2,4,6-Tribromoaniline from aniline - Arrange the following compounds in increasing order of their boiling point:
\[ \text{(CH}_3\text{)}_2\text{NH, CH}_3\text{CH}_2\text{NH}_2, \text{CH}_3\text{CH}_2\text{OH} \]
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Concepts Used:
Amines
Amine is a type of compound which is derived from ammonia (NH3). According to Organic chemistry, they are basically classified as the functional groups of the organic nitrogen compounds that contain nitrogen atoms with a lone pair.
Amine - Types
Primary Amines:
It is formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group. Amino acids and methyl amine are the best examples that why aromatic amines include aniline.
Secondary Amines:
Amines that have two organic substitutes either alkyl or aryl ones or both and are bound to the nitrogen together with one hydrogen are termed as secondary amines. For Example, Dimethylamine.
Tertiary Amines:
Tertiary Amines are the amines where the nitrogen consists of three organic substitutes. For example, Trimethylamine and EDTA.