Which of the organic compounds will give red colour in Lassaigne test?

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

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\begin{matrix} S | | N H_{2} & - C - & N H_{2} \end{matrix}

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\begin{matrix} O | | N H_{2} & - C - & N H_{2} \end{matrix}

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None of these

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Solution

The correct option is A $\begin{matrix} S | | N H_{2} & - C - & N H_{2} \end{matrix}$
It is a test which is used to detect the presence of elements such as Nitrogen (N), Sulfur (S), Chlorine (Cl), Bromine (Br) and Iodine (I) with the help of Sodium Fusion Extract (SFE).
Prussian blue color indicates the presence of nitrogen,red color indicates the presence of sulphur.

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