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
- Assertion (A): Boiling point of (C6H5)2NH is lower than that of n-C4H9NH2. Reason (R): Hydrogen bonding is much more extensive in (C6H5)2NH as compared to n- C4H9NH2.
- Arrange the following compounds as asked:
(a) In decreasing order of pKb values
C2H5NH2, (C2H5)2NH, C6H5NHCH3, C6H5NH2
(b) In increasing order of boiling point
C2H5OH, C2H5NH2, (CH3)2NH
(c) In increasing order of solubility in water
C6H5NH2, (C2H5)2NH, C2H5NH2 - Arrange the following compounds as asked:
(a) In decreasing order of pKb, values: C$_6$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NHCH$_2$CH$_3$, C$_6$H$_5$NH$_3$
(b) Increasing order of boiling point: C$_6$H$_5$OH, C$_2$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NH$_2$
(c) Increasing order of solubility in water: C$_6$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NHCH$_2$CH$_3$ - Assertion (A): Acetanilide is less basic than aniline.
Reason (R): Acetylation of aniline results in decrease of electron density on nitrogen. - Hoffmann Bromamide degradation reaction is given by:
Questions Asked in NEET exam
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A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
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- De-Broglie wavelength of an electron orbiting in the \(n = 2\) state of hydrogen atom is close to (Given Bohr radius = 0.052 nm):
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- de broglie hypothesis
- The plates of a parallel plate capacitor are separated by d. Two slabs of different dielectric constant \(K_1\) and \(K_2\) with thickness \(d/2\) and \(d/2\) respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If \(K_1 = 1.25 K_2\), the value of \(K_2\) is :
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- Capacitors and Capacitance
- A wire of resistance \(R\) is cut into 8 equal pieces. From these pieces, two equivalent resistances are made by adding four of these together in parallel. Then these two are added in series. The net effective resistance of the combination is:
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- Resistance
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.