A)
B) \[-N{{H}_{2}}\]
C) \[-CONH-\]
D) \[-C\equiv H\]
Correct Answer: C
Solution :
All compounds containing peptide linkage \[(-CO\cdot NH-)\] give respond to Biuret test. For example, urea and proteins. Biuret test for urea: On heating, urea loses \[N{{H}_{3}}\] and forms solid biuret. This is dissolved in the least amount of water and made alkaline by adding a few drops of sodium hydroxide. The alkaline solution, when treated with \[1-2\] drops of dilute \[CuS{{O}_{4}}\] solution, gives a violet colour. This test is known as Biuret test.
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