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

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

JEE MainJEE Main 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

Kjeldahl's method for estimation of nitrogen is not applicable for nitrobenzene $C_6H_5NO_2$. because reaction with $H_2SO_4$, nitrobenzene can not give ammonia.