Tautomerism|Conditions For Tautomerism|Stability Of Tautomer|Stereoisomerism|Geometrical Isomerism (G.I.)|Conditions For G.I.|Stereogenic Centre (S.C)|OMR

Which of the following are the types of stereoisomerism ? I. Linkage isomerism II. Optical isomerism III. Geometrical isomerism IV. Ionisation isomerism Choose the correct pair of stereoisomers.

S-I: Ethene does not show geometrical isomerism. S-II: Alkenes can not show geometrical isomerism.

Tautomerism : Structural Isomers that undergo rapid interconversions and exist in dynamic equilibrium are known as Tautomers and relationship between them is known as Tautomerism. Tautomers generally have different functional groups. At equilibrium more stable tautomer is present in higher amount by ratio remains same until and unless change is made externally. Tautomerism actually arises due to rapid oscillation of an atoms between two polyvalent atoms in a molecule underset("Keto form")(underset(H)underset(|)(C)H_(2)-overset(O)overset(||)(CH)) hArr underset("enol form")(CH_(2)=overset(OH)overset(|)(CH) Above is an example of Keto-enole tautomerism. condition for this type of keto enol tautomerism is presence of alpha-H . amount of enol at equilibrium is known as enolic content. it is more if enol is more stable and less if keto is more stable. Which of the following can tautomerise

Calculation OF G.I || Introduction OF contributional Isomerism