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Dehydrohalogenation for Alkenes

The enol form...

Question

The enol form of:

A

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B

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C

No enol form exits

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D

Both a & b

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Solution

The correct option is B

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Similar questions

Q. In keto-enol tautomerism of 1,3-dicarbonyl compounds, the enol form is preferred in contrast to the keto-enol form, this is due to:

Q. The conversion of a keto form into enol is enolisation. It depends on structural factor, temperature and nature of solvent. Resonance and hydrogen bonding increases enol content. Enolic form of phenol is more stable than keto form by -13 kcal/mole of energy hence phenol exist exclusively as an enol. Enolic tautomer is less polar due to intramolecular hydrogen bonds than the corresponding keto form. Any polar solvent would decrease the enolisation and favour keto form intramolecular hydrogen bonding stablized enol form by 7kcal/mole and resonance stabilizes enol form by 15 kcal/mole.
The enol content of ethyl acetoacetate is maximum in :

Q. Assertion A: Enol form of acetone

[C H_{3} C O C H_{3}]

< 0.1 %

quantity. However, the enol form of the acetyl acetone

[C H_{3} C O C H_{2} O C C H_{3}]

exists in approximately

15 %

quantity.
Reason R: Enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone.
Choose the correct statement.

In which one of the following keto-enol system is the keto form more stable than the enol form?

Q. Which of the following has the highest percentage of enol form in Keto-enol equilibrium?

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Dehydrohalogenation for Alkenes

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