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By Jagdamba Singh, R. K. P. Singh, L. D. S. Yadav, I. Q. Siddiqui

The target of this booklet is to supply enough wisdom to its readers concerning the proposal of complicated useful CHEMISTRY

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13. Maltose (insoluble in ether); m-dinitrobenzene (soluble in ether) and a-Naphthyl amine (soluble in ether). Separation by ether and then HCl. 14. Sucrose (insoluble in ether); Bibenzyl (soluble in ether) and p-nitrophenol (soluble in ether). Separation by ether and than NaOH. 121 SYSTEMATIC IDENTIFICATION OF INDIVIDUAL ORGANIC COMPOUNDS SEPARATED FROM THE MIXTURE After the successful separation of the mixture, identify the individual compounds. Before identification it will be expected to make certain that the separated individual compound (or given single compound) is pure.

Mixture (10 g) IShake with 20 ml water and filter * t Filtrate (Test for -OH and -COOH group) only -OH group is present Residue Test for the presence of -OH and -COOH group: It contains -COOH group. Wash the residue with water. Shake it with 15 ml saturated NaHC03 solution till the effrvescence stops. Filter l Evaporate on water bath I Residue (catechol) compound-I Residue l wash with saturated NaHC03 solution and dry Compound-3 (benzamide) Filtrate Collect the filtrate in a beaker and acidify with cold concentrated HCI.

Boil the mixture gently for one minute. Cool and acidify by adding conc. H 2S0 4 until the ferrous hydroxide just djssolves. Appearance of prussian blue colour or precipitate indicates the presence of nitrogen. 0-43 SYSTEMATIC IDENTIFICATION OF ORGANIC COMPOUNDS Fe504 + 2NaOH ---+ Fc(OH) 2 + Na 2SO 4 Fe (OH) 2 + 2NaCN ---+ Fe(CN) 2 + 2NaOH Fe(CNh +4NaCN ---+ Na4[Fe(CN)6] Sodium ferrocyanide Conc. H2 SO 4 is an oxidising agent. In the presence of H2 504 ferrous sulphate changes to ferric sulphate.

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