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Question

The correct statement regarding a carbonyl compound with a hydrogen atom on Its alpha carbon is?


A

A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.

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B

A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibrium.

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C

A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.

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D

A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates its corresponding enol and this process is known as keto-enol tautomerism.

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Solution

The correct option is D

A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates its corresponding enol and this process is known as keto-enol tautomerism.


Explanation for correct answer:

Option (D): A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates its corresponding enol and this process is known as keto-enol tautomerism.

  • Keto-enol tautomerism is the process in which there is interconversion between keto and enol form.
  • Dynamic equilibrium is established between the keto and enol forms.
  • The keto and enol form coexist in the same reaction chamber but the percentage of that form is higher which is more stable.

Explanation for incorrect answer:

Option (A): A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.

  • In keto-enol tautomerism, the keto form is in dynamic equilibrium with the corresponding enol form.
  • Hence it is the incorrect option

Option (B): A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibrium.

  • An aldehyde and a ketone are functional isomers and they can never be tautomers.
  • So, A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol, and this process is known as keto-enol tautomerism.
  • Hence it is the incorrect option

Option (C): A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.

  • carbonylation is the process of the incorporation of a carbonyl group to a compound.
  • So, A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol, and this process is known as keto-enol tautomerism.
  • Hence it is the incorrect option

Therefore the correct option is (D).


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