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Topic: Quantitative analysis: estimation of C, H, N, halogens, S, P· Purification and Characterisation of Organic Compounds

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 Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds ?

four structures: azobenzene, nitrobenzene, pyridine, aniline

1. [structure in figure]

2. [structure in figure]

3. [structure in figure]

4. [structure in figure]

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Answer: 4. [structure in figure]

Key idea: Kjeldahl's method converts N to \(\mathrm{(NH_4)_2SO_4}\) on digestion; it fails for N in nitro, azo groups and in rings (pyridine).

Azobenzene, nitrobenzene and pyridine are therefore unsuitable. Aniline (an amino group) works, so option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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