The compound that does not give a positive te | vedclass

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(B) Lassaigne's test is used to detect nitrogen, sulfur, and halogens in organic compounds. The test involves fusing the organic compound with met

Vedclass · Accepted Answer

Benzene diazonium chloride

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(B) Lassaigne's test is used to detect nitrogen, sulfur, and halogens in organic compounds. The test involves fusing the organic compound with metallic sodium to convert the elements into water-soluble sodium salts like $NaCN$, $Na_2S$, and $NaCl$.
In the case of benzene diazonium chloride $(C_6H_5N_2^+Cl^-)$, the diazonium group is unstable. Upon heating with sodium metal, the nitrogen atoms are released as $N_2$ gas before they can react with sodium to form $NaCN$. Consequently, the test for nitrogen becomes negative.
Other compounds like $o$-nitrophenol, sulfanilic acid, and $m$-chloroaniline contain nitrogen in more stable forms that successfully convert to $NaCN$ during the fusion process, thus giving a positive test.

The compound that does not give a positive test for nitrogen in Lassaigne's test is

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