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

C H_{3} C H_{2} - C \equiv N

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C_{6} H_{5} N H_{2}

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C_{6} H_{5} N O_{2}

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Solution

The correct option is C $C_{6} H_{5} N O_{2}$
Kjeldahl's method cannot be used for the estimation of nitrogen in the compounds in which nitrogen is involved in nitro, diazo groups or is present in the ring, as nitrogen atom cannot be converted to ammonium sulphate under the reaction conditions.

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