2 . Iodoform ( tri-iodornethane , CHl3 ) Iodoform is prepared by iodoform reaction .
Compounds containing either CH 3 CO- or CH 3 CH ( OH ) group form yellow colour iodoform with I 2 and NaOH .
Iodoform when comes in contact with organic matter , decomposes easily to free iodine , an antiseptic . Due to its objectionable smell , it has been replaced by other formulations containing iodine .
Polyhalogen Derivatives
1 . Tetrachloromethane ( Carbon Tetrachloride , CCl 4 )
Preparation
CCI 4 is a colourless , non-inflammable , poisonous liquid , soluble in alcohol and ether .