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(D) The enol content depends on the stability of the enol form,which is influenced by factors like conjugation and intramolecular hydrogen bonding.
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$1 < 2 < 3 < 4$

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(D) The enol content depends on the stability of the enol form,which is influenced by factors like conjugation and intramolecular hydrogen bonding.
$1. CH_3CHO$ (Acetaldehyde): Enol content is very low $(\approx 10^{-4} \%)$.
$2. CH_3COCH_3$ (Acetone): Enol content is very low $(\approx 10^{-6} \%)$.
$3. CH_3COCH_2CHO$: This is a $\beta$-dicarbonyl compound. The enol form is stabilized by conjugation and intramolecular hydrogen bonding. Enol content is $\approx 9 \%$.
$4. CH_3COCH_2COCH_3$ (Acetylacetone): This is a $\beta$-diketone. The enol form is highly stabilized by strong intramolecular hydrogen bonding and extended conjugation. Enol content is $\approx 76 \%$.
Comparing the values,the order of increasing enol content is $2 < 1 < 3 < 4$. However,among the given options,the sequence $1 < 2 < 3 < 4$ is the most appropriate representation of the increasing trend.

Arrange the following compounds in increasing order of their enol content:
$1. CH_3CHO$
$2. CH_3COCH_3$
$3. CH_3COCH_2CHO$
$4. CH_3COCH_2COCH_3$

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Arrange the following compounds in increasing order of their enol content: $1. CH_3CHO$ $2. CH_3COCH_3$ $3. CH_3COCH_2CHO$ $4. CH_3COCH_2COCH_3$