acetaldehyde iodoform test

During rectification of alcohol by the fractional distillation method, the first fraction contains acetaldehyde..

Laboratory preparation It is prepared in the laboratory by the action of iodine on ethyl alcohol or acetone, in the presence of alkali. This is called haloform reactio..

It is a yellow colored crystalline solid with melting point 392 K. It has a characteristic unpleasant odor. It is insoluble in water but readily dissolves in ethyl alcohol and ether. Due to liberation of free iodine it has an antiseptic action..

Preparatio..

Chemical properties of iodoform ar..

Ethanol can be identified by the fruity odour it emits when heated gently with sodium acetate and concentrated sulphuric acid. This is due to the formation of ethyl acetate. Iodoform test: When a few drops of alcohol is warmed with iodine and potasium hydroxide, yellow precipita..

Iodoform can be reduced with P and HI to give methylene iodide...

The reactions taking place are similar to the above reactions, finally giving rise to iodoform: ..

Derivatives of Haloalkanes and Haloarenes - Dichloroethanes - Polyhalogen derivatives of alkanes are the halogen derivatives of alkanes containing more than one halogen atom per molecule. For example, ethylene dichloride, ethylidene chloride, chloroform, iodoform, carbon tetrachloride, et..

With ethyl alcohol, the reactions take place in three steps as: Oxidation occurs to give: Iodination takes place: The complete reaction may be written as:..