Question

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

• A. $C_6H_5NO_2$
• B.
• C. $CH_{3}CH_{2}-C\equiv N$
• D. $C_6H_5NH_2$

Answer 1

Answer: (A)

$C_6H_5NO_2$

Answer 2

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.