Which of the following is true.

1.the two tautomeric formd differ in stability.

2.tautomers are in dynamic equilibrium with each other.

3. Tautomers are interconvertible.

4. Tautomerism is a reversible intramolecular change.

So all of them are true. But it is given that 3rd option is wrong. When I seen explanation of given answer it is given that 3rd option is correct. So plz confirm about it and explain how they are interconvertible with example

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Solution

option(3) is correct
Tautomers are organic compounds that are interconvertible by tautomerization.Tautomerization results in the formal migration of a hydrogen atom or proton, accompanied by a switch of a single bond and an adjacent double bond. Usually the catalysts of these reactions are acids or bases. In solution there is an equilibrium state between the tautomeric forms. Some types of tautomers: ketone-enol, amid-imidic acid, lactam-lactim, enamine-imine tautomeric forms.

eg:

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