Bonding in organic molecule - class-XII

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Multiple Choice

In which compound enol form is maximum

  1. $CH _3-\overset{\overset{O}{||}}C-CH _3$
  2. ${ CH } _{ 3 }-CH=O$
  3. ${ CH } _{ 3 }-\underset { || }{ C } -{ CH } _{ 2 }-CH _3\\ \quad \quad \quad O$
  4. ${ CH } _{ 3 }-{ CH _2 } -{ CH } _{ 3 }\\ \quad \quad \quad \quad $
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