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Sigma Bond and Pi Bond

The enolic fo...

Question

The enolic form of ethyl acetoacetate has:

A

9 sigma bonds and 1 pi bond

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B

18 sigma bonds and 2 pi bonds

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C

16 sigma bonds and 1 pi bond

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D

9 sigma bonds and 2 pi bonds

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Solution

The correct option is B 18 sigma bonds and 2 pi bonds
The enolic form of ethyl acetoacetate has 18 sigma bonds and 2 pi bonds

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The enolic form of ethyl acetoacetate as below has

Q. The enolic form of ethyl acetoacetate as given below has :

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. Ethyl acetoacetate shows, which type of isomerism?

Q. Which of the following isomerism is shown by ethyl acetoacetate?

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