Dear Nitesh,

In simple aldehydes and ketones ( i.e, acetaldehyde and acetone) the amount of enolic form is negligible. However, if the enolic form is stabilized by intra-molecular hydrogen bonding ( chelation), the amount of enolic form is much greater.

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Aman Bansal

Askiitian Expert

The enolic form of acetylaceton is more stable because of h-bond and conjugation bw c=o and c=c.In acetoaceticester's inolic form there is a h-bond but because of CROSS CONJUGATION bw (c=o and c=c) and (c=o and oxygen's lp) it is less stable than its ketonic form.Because cross conjugation decrease the stablity of compouds.