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Polyhalogen Compounds

The sodium ex...

Question

The sodium extract of an organic compound on acidification with acetic acid and addition of lead acetate solution gives a black precipitate.
The organic compound contains :

A

nitrogen

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B

halogen

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C

sulphur

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D

phosphorus

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Solution

The correct option is C sulphur
The organic compounds containing sulphur when react with sodium metal give $N a_{2} S$ . The $N a_{2} S$ when react with lead acetate forms black ppt. of $P b S$ .
$N a_{2} S + {(C H_{3} C O O)}_{2} P b \to P b S + 2 C H_{3} C O O N a$

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