The compound that does not give a blue colour in Lassaigne's test is

Aniline

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Glycine

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Hydrazine

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Urea

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Solution

The correct option is C Hydrazine
Lassaigne's test is bases upon the formation of $N a C N .$ Since hydrazine $(N H_{2} N H_{2})$ does not contain carbon, it cannot form $N a C N$ during $N a$ fusion and hence does not give blue colour. All the remaining three compounds (aniline, glycine and urea) contain both $C$ and $N$ needed for the formation of $N a C N$ and thus give blue colour.

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Similar questions

The compound that does not give a blue colour in lassaigne's test is

{N H}_{2} - {N H}_{2}

{F e}_{4} {[F e ({C N}_{6})]}_{3}

F e {S o}_{4}, F e {C I}_{3}

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