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  4. 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

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Q. 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

VITEEEVITEEE 2014

Solution:

The organic compounds containing sulphur when react with sodium metal give $Na_2 S.$ The $Na_2S$ when react with lead acetate forms black ppt. of $PbS$.
$Na2S + (CH3COO)2Pb \longrightarrow \underset{\text{Black \, ppt }}{\ce{PbS }} + 2CH_3COONa$