Discussion Forum



1)

 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

B) halogen

C) sulphur

D) phosphorus

Answer:

Option C

Explanation:

The organic compounds containing sulphur when reacting with sodium metal give $Na_{2}S$. The $Na_{2}S$ when reacting with lead acetate forms black ppt.of PbS

$Na_{2}S+(CH_{3}COO)_{2}Pb  \rightarrow  PbS+2CH_{3}COONa$

                                                               Black ppt.