The difference between Geometric isomerism and Stereoisomerism
When used as nouns, geometric isomerism means a form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides, whereas stereoisomerism means a form of isomerism in which atoms are arranged differently about a chiral centre (or centre of asymmetry). they exhibit optical activity, and in a molecule with a single chiral centre the two isomers (enantiomers) are mirror images of each other whereas in a molecule with multiple chiral centres the isomers (diastereoisomers) are not normally mirror images.
check bellow for the other definitions of Geometric isomerism and Stereoisomerism
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Geometric isomerism as a noun (chemistry, dated, [[deprecated]] by [[IUPAC]]):
A form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides; these are cis- and trans- isomers, respectively.
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Stereoisomerism as a noun (chemistry):
A form of isomerism in which atoms are arranged differently about a chiral centre (or centre of asymmetry). They exhibit optical activity, and in a molecule with a single chiral centre the two isomers (enantiomers) are mirror images of each other whereas in a molecule with multiple chiral centres the isomers (diastereoisomers) are not normally mirror images.