JEE Mains · Chemistry · STD 12 - p -Block elements - ll
Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?
- A \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2}\)
- B \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{N} \mathrm{H}_{2}\)
- C \(\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{C}\equiv \mathrm{N}\)
- D \(\begin{array}{*{20}{c}}
O \\
{||} \\
{N{H_2} - C - N{H_2}}
\end{array}\)
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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