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Haloform reaction....

Haloform reaction.

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Aldehydes and ketones having alpha methyl group `(CH_(3)CO)` undergo haloform reaction with halogens and alkali or `Na_(2)CO_(3)`
`CH_(3)CHOoverset(Cl_(2)//OH^(-))(to)C Cl_(3)CHOunderset((ii)H^(+))overset((i)OH^(-))(to)CHCl_(3)+HCOOH`
`CH_(3)COCH_(3)overset(Cl_(2)//OH^(-))(to)C Cl_(3)COCH_(3)underset((ii)H^(+))overset((i)OH^(-))(to)CHCl_(3)+CH_(3)COOH`
Common aldehydes and ketones which undergo this reaction are :
`CH_(3)CHO," "CH_(3)COCH_(3)," "CH_(3)COCH_(2)CH_(3)," and "CH_(3)COCO_(2)H`.
All compounds which undergo easy oxidation with halogens to give `alpha`-methyl aldehyde or ketone will give haloform reaction. These are `CH_(3)CHOHCH_(3),CH_(3),CH_(3)CH_(2)OH` and `CH_(3)CHOHCO_(2)H`.
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