What is the difference between isomerism and tautomerism?

Answer 1

The structure changes in tautomers i.e. a proton leaving a carbon bond and attaching to a ketone group.

Resonance is the concept that electron density is sometimes shared between multiple bonds. In a Lewis structure, this can be expressed as double bonds swapping between two oxygens or two different set bonding set ups have Oxygen or Nitrogen bearing a formal charge.

For the actual measurement of bonds, the bond lengths between multiple resonating bonds tend to be an intermediate length between double and single bonds. This supports the idea that electron density is shared between several bonds in a resonating molecule. Benzene bonds are a good example of intermediate bond lengths due to resonance.

In Tautomerism the alpha-hydrogen is shifted where as in Resonance the PI electrons are delocalised to loss more energy and to get stability.

Answer 2

Isomerism refers to molecules with the same molecular formula but different structures, while tautomerism is a specific type of isomerism where molecules can interconvert by a chemical reaction, typically involving the movement of a hydrogen atom and a double bond. Tautomers exist in equilibrium with each other, with one form usually being more stable than the other.

Answer 3

Tautomerim is a type of isomerism , tautomers are those structural isomers in which a hydrogen atom and a pi bond are at different positions they are only two and exist in equilibrium a dynamic equilibrium and can not be separated by any means.