JEE Main levelSingle correct optionDifficulty 2 of 3co121
Why is the haloform reaction with iodine (CHIX3) preferred over those giving CHClX3 or CHBrX3 as a laboratory test?
AIodine is a stronger oxidising agent than chlorine
BIodoform is a yellow solid that separates from the aqueous mixture, whereas chloroform and bromoform are colourless liquids
COnly iodine can halogenate the alpha carbon of a ketone
DIodoform is the only haloform that dissolves in the reaction mixture
Answer: B
A test must give an easily seen change. CHIX3 is an insoluble yellow solid with a characteristic smell, whereas CHClX3 and CHBrX3 are colourless dense liquids that are hard to notice. Chlorine is in fact the stronger oxidant.