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JEE Mains · Chemistry · STD 12 - p -Block elements - ll

निम्नलिखित यौगिकों में से किसके लिए नाइट्रोजन के आकलन के लिए केल्डाल विधि का उपयोग नहीं किया जा सकता है ?

  1. A \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2}\)
  2. B \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{N} \mathrm{H}_{2}\)
  3. C \(\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{C}\equiv \mathrm{N}\)
  4. D \(\begin{array}{*{20}{c}}
      O \\ 
      {||} \\ 
      {N{H_2} - C - N{H_2}} 
    \end{array}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2}\)

Step-by-step Solution

Detailed explanation

Kjeldahl's method for estimation of nitrogen is not applicable for nitrobenzene \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2}\) because reaction with \(\mathrm{H}_{2} \mathrm{SO}_{4},\) nitrobenzene can not give ammonia.
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