MCQ
Proteins when heated with conc. $HN{O_3}$ give a yellow colour. This is
- AOxidising test
- ✓Xanthoprotic test
- CHoppe's test
- DAcid-base test
✓
Answer
Correct option: B.
Xanthoprotic test
b
(b) Protein + conc. $HN{O_3}$ $\to$ Yellow colour
(b) Protein + conc. $HN{O_3}$ $\to$ Yellow colour
[This test is given by a protein which consists of $\alpha$- amino acids containing a benzene ring such as tyrosine, phenylalanine etc. The yellow colour is due to nitration of benzene ring.]
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The molar conductance of $\mathrm{NaCl}, \mathrm{HCl}$ and $\mathrm{CH}_{3} COONa$ at infinite dilution are $126.45,426.16$ and $91.0\, \mathrm{~S} \,\mathrm{~cm}^{2} \,\mathrm{~mol}^{-1}$ respectively. The molar conductance of $\mathrm{CH}_{3} \mathrm{COOH}$ at infinite dilution is. Choose the right option for your answer. (In $\mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1}$)
→In the reduction of nitrobenzene, which of the following is the intermediate
Identify the wrong statement in the following.
The internal energy of an ideal gas increases during an isothermal process when the gas is
Solubility product of a sulphide $MS$ is $3 \times {10^{ - 25}}$ and that of another sulphide $NS $ is $4 \times {10^{ - 40}}$. In ammoniacal solution
→Outermost electronic configurations of four elements $A, B, C, D$ are given below.
→$3 s^{2}$; $3 s^{2} 3 p^{1}$; $3 s ^{2} 3 p ^{3}$; $3 s^{2} 3 p^{4}$
The correct order of first ionization enthalpy for them is.
The stability order of the following carbocations is
If $(P)\,and\, (Q)$ are major products, then find incorrect statement for given sequence
→$\begin{array}{*{20}{c}} {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ {( \pm )\,\,C{H_3} - C{H_2} - CH - C{H_3}} \end{array}$ $\xrightarrow[\Delta ]{{{H_3}P{O_4}}}P\,\xrightarrow[{Ni}]{{{D_2}}}Q$
At $80\,^oC$ , the vapour pressure of pure liquid $A$ is $520\,mmHg$ and that of pure liquid $B$ is $1000 \,mmHg$ . If a mixture of $A$ and $B$ boils at $80\,^oC$ and $1\,atm$ pressure, the amount of $A$ in the mixture is ........ $mol\,\%$.
→Addition of bromine on propene in the presence of brine yields a mixture of :