In which of the following compounds, nitrogen cannotbe tested by Lassaigne's test?

C H_{3} C O N H_{2}

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N H_{2} . N H_{2} . H_{2} O

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C_{6} H_{5} N H_{2}

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C_{6} H_{5} N O_{2}

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Solution

The correct option is C $N H_{2} . N H_{2} . H_{2} O$
Lassaigne's test:
Compound containing diazo compounds can not be tested by this so
$N H_{2} . N H_{2} . H_{2} O$ can not be tested by this since it does not contain C. So $C N^{⊝}$ ion is not obtained which is an essential condition for the test for N.

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Which of the following compound will answer lassaigne's test for nitrogen?

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