A specific organic compound successfully yields a deep Prussian blue coloration during Lassaigne's t — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Azobenzene contains an azo group ($-N=N-$). While it possesses both C and N to form $NaCN$ during fusion (yielding a positive qualitative test), compounds with azo linkages strongly resist the reductive conversion to $NH_4^+$ required during Kjeldahl's acid digestion.