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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 $$Na_{2}S$$. The $$Na_{2}S$$ when react with lead acetate forms black ppt. of $$PbS$$.
$$Na_{2}S+\left ( CH_{3}COO \right )_{2}Pb\rightarrow PbS+2CH_{3}COONa$$

Chemistry
NCERT
Standard XII

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