Maximum enol content is observed in (a) CH3 COCH2 COOC2 H5 (b) (c) CH3 COCH2 COCH3 (d) CH3 COCH3

Name: Problem 56, Chapter 23: A Complete Resource Book in Chemistry for JEE Main
Uploaded: 2021-10-19T18:02:17-08:00
Duration: 1 min 23 s
Channel: Alkendra Singh
Description: Maximum enol content is observed in (a) CH3 COCH2 COOC2 H5 (b) (c) CH3 COCH2 COCH3 (d) CH3 COCH3

step 1 Hello, portion is maximum in all content is observed in. So we are going to discuss in which of

Maximum enol content is observed in (a) CH3 COCH2 COOC2 H5...

Maximum enol content is observed in
(a) $\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{COOC}_{2} \mathrm{H}_{5}$
(b)
(c) $\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{COCH}_{3}$
(d) $\mathrm{CH}_{3} \mathrm{COCH}_{3}$

Key Concepts

Intramolecular Hydrogen Bonding

Intramolecular hydrogen bonding occurs when the hydrogen of the hydroxyl group in the enol form forms a bond with an electronegative atom within the same molecule, often a carbonyl oxygen. This interaction stabilizes the enol form by further lowering its energy and contributes significantly to an increased enol content in compounds where such bonding is geometrically feasible.

Acidity of Alpha Hydrogens

The acidity of alpha hydrogens (those adjacent to the carbonyl group) is a key factor in enolization. More acidic alpha hydrogens are more easily deprotonated, facilitating the keto to enol transformation. The presence of electron-withdrawing groups can increase this acidity, thus promoting the formation of the enol tautomer.

Keto-Enol Tautomerism

This concept refers to the chemical equilibrium between the keto form (containing a carbonyl group) and the enol form (containing a carbon-carbon double bond and an alcohol group). The position of the equilibrium depends on the relative stability of each form, which is influenced by structural and electronic factors within the molecule.

Conjugation

Conjugation involves the delocalization of electrons across adjacent pi bonds or between a pi bond and a lone pair, which can stabilize the enol form. In structures where the enol double bond is conjugated with carbonyl groups or other unsaturated systems, the increased electron delocalization lowers the energy of the enol form, thus increasing its relative content in the equilibrium mixture.

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