19no answers expected???? confirm ??? i will answer myself !!
why doesn't acetic acid respond to haloform test ?(you can also consider why acetamide and acetyl chloride don't respond to this test though all have keto methyl groups )
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19Due to the development of acetate ion the fourth OH- attack the system thereby inhibiting the reaction !!!(i hope you know that haloform involves use of 4 OH- ions)
1l.p reduces positive charge on the carbonyl carbon. now the +ve charge is responsible for making the H in CH3 acidic by stabilising the carbanion formed after removal of the H
as the + charge intensity decreases the carbanion becomes less stable making the H less acidic
thus the removal of H becomes more harder making the haloform reaction less feasible
also the removal of H is the rate determining step