JEE MainChemistryGeneral Organic Chemistry
Consider the following organic compounds: (I) Aniline (II) Nitrobenzene (III) Pyridine (IV) Urea Which of the given compounds will NOT yield ammonium sulphate when subjected to Kjeldahl's method?
Options
- A(I) and (IV) only
- B(III) only
- C(I), (II) and (III) only
- D(II) and (III) only
Correct answer
D. (II) and (III) only
Step-by-step solution
Kjeldahl's method is used for the estimation of nitrogen in organic compounds. However, this method is not applicable to compounds containing nitrogen in nitro groups, azo groups, and nitrogen present in the ring (e.g., pyridine, quinoline). In such compounds, the nitrogen cannot be easily converted into ammonium sulphate by heating with concentrated sulphuric acid. Nitrobenzene (II) contains a nitro group and Pyridine (III) contains nitrogen in an aromatic ring. Therefore, they will not yield ammonium sulphate in