A) \[N{{H}_{2}}COON{{H}_{4}}\]
B) \[HCOON{{H}_{4}}\]
C) \[N{{H}_{2}}NHCHO\]
D) \[N{{H}_{2}}CON{{H}_{2}}\]
Correct Answer: D
Solution :
Element | % | Atomic mass | Relative no. of atoms | Simplest ratio |
C | 20 | 12 | 1.66 | 1 |
H | 6.7 | 1 | 6.7 | 4 |
N | 46.7 | 14 | 3.33 | 2 |
O | 26.6 | 16 | 1.66 | 1 |
Empirical formula = Molecular formula =\[C{{H}_{4}}{{N}_{2}}O\] |
or \[N{{H}_{2}}CON{{H}_{2}}\]\[{{H}_{2}}NCON{{H}_{2}}+{{H}_{2}}NCON{{H}_{2}}\xrightarrow{\Delta }\]\[{{H}_{2}}{{\underset{biuret}{\mathop{NCONHCONH}}\,}_{2}}+N{{H}_{3}}\] |
When an aqueous solution of residue is treated with dilute sodium hydroxide and a drop of copper sulphate, a violet colour is produced. This test is known as biuret test, is characteristic of compounds having the group -CONH. |
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