Question

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

• A. $CH_{3}CH_{2}-C\equiv N$
• B. $C_{6}H_{5}NH_{2}$
• C. $C_{6}H_{5}NO_{2}$
• D. $NH_{2}CONH_{2}$

Answer 1

Answer: (C)

Kjedahl's method cannot be used to test nitrogen in nitro and diazo present in ring because nitrogen in nitro and diazo groups cannot be converted into ammonium sulphate.