Kjeldahl's method cannot be used to estimate

Question:

Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

  1. (1) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2}$

  2. $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}$

  3. $\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{N}$

Correct Option: 1

Solution:

Kjeldahl's method for estimation of nitrogen is not applicable for nitrobenzene $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2}$. because reaction with $\mathrm{H}_{2} \mathrm{SO}_{4}$, nitrobenzene can not give ammonia.

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