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

Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?
  1. C6H5NH2
  2. CH3CH2-C≡N
  3. C6H5NO2

Solution

Kjeldahl method is not applicable to nitro or diazo groups present in the ring, as nitrogen atom can't be converted to ammonium sulphate under the reaction conditions.

Asked in: JEE Main 2020 (08 Jan Shift 2)

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