Kjeldahl's method cannot be used for estimation of nitrogen in: (I) C_(6)H_(5)CONH_(2) (II) Pyridine (III) C_(6)H_(5)-N=N-C_(6)H_(5) (IV) C_(6)H_(5)NHCOCH_(3)

Kjeldahl's method cannot be used for estimation of nitrogen in: (I) C_

1.	Kjeldahl's method cannot be used for estimation of nitrogen in: (I) C_(6)H_(5)CONH_(2) (II) Pyridine (III) C_(6)H_(5)-N=N-C_(6)H_(5) (IV) C_(6)H_(5)NHCOCH_(3)
Answer» I,II II,III III,IV I,II Answer :B