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Q.

For which of the following compounds the Lassaigne’s test of nitrogen will fail

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a

${CH}_{3} {CONH}_{2}$

b

$H_{2} {NNH}_{2} . 2 HCl$

c

$C_{6} H_{5} {NH}_{2}$

d

$H_{2} {NCONH}_{2}$

answer is B.

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Detailed Solution

Nitrogen is present but carbon is absent, hence NaCN cant form.

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