How solvent effect the enol percentage in keto-enol tautomerism?

yes because alfa carbon has one protan

This will only occur if the alpha carbon to the carbonyl group can be protonated. The keto form of acetone (for example), would be a -CH2COCH3. The alpha carbon has lost a hydrogen and is negatively...

Constitutional isomers

in keto form C=O bond is more stable than C=C bond in enol form

The cage effect describes how molecules are affected by their surroundings. For example, reactants in a liquid can be trapped in a "cage" of solvent molecules. In this cage, many collisions occur...