Doubt from enol content

plz explain how d is answer.

Enols are basically alkenes so any factor that stabilise alkene also stabilise enol Hence D will answer. Further H bonding is responsible for any enol formation in option C and D. Thanks

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The two main factors affecting the stability of the enol forms are

  1. Hydrogen Bonding
  2. Aromaticity.

What @Ankith_2020 said is right. Formation of double bond is stable and Hydrogen bonding will result in more stability. Hence more chance of formation of enol.

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