Nitrogen can be estimated by Kjeldahl’s method for which of the following compound?
A
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B
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C
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D
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Solution
The correct option is D
Explanation for correct answer:-
Option (D)
Kjeldahl method is used in order to determine the Nitrogen content in the various organic and inorganic compounds.
But there are some limitations while using this method as some compounds are not suitable for this method.
Compounds that have nitrogen in the Azo or nitro group or the compounds where nitrogen is present in the ring(Pyridine, Quinoline) can't be detected by this method.
In this compound the Nitrogen is not directly attached to the Benzene ring, nor there is presence of an Azo or Nitro group.
Thus the Kjeldahl method is suitable for this compound.
Explanation for incorrect answer:-
Option (A)
This compound is Benzene diazonium chloride and here there is a presence of an Azo group.
Thus it is not suitable for the Kjeldahl method.
Hence it is the incorrect option.
Option (B)
This compound is Nitro benzene and here there is a presence of a nitro group.
Thus it is not suitable for the Kjeldahl method.
Hence it is the incorrect option.
Option (C)
This compound is Nitro benzene and here the Nitrogen is attached to the ring itself.
Thus it is not suitable for the Kjeldahl method.
Hence it is the incorrect option.
Therefore, Nitrogen can be estimated by Kjeldahl’s method for option (D)
