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Non-superimposable mirror images.

Same physical properties except rotation of polarized light
Same chemical properties except with chiral molecules

Similar - Large in physical and chemical properties.

Same molecular weight and molecular formula.
Different atomic connectivity.
Different physical properties.
Different chemical properties.

*Number of isomers per CH formula.

Same atomic connectivity, but different arrangement in space.

1. Conformational
2. Geometric
3. Enantiomers
4. Diastereomers
5. Meso compounds

Do not need bond breaking to convert from one to another.
i.e. rotation about a bond.

Same physical and chemical properties.

Require bond breaking to interconvert.

1. Geometric
2. Optical

Stereoisomerism at a double bond or cycloalkane.
i.e. cis or trans, (Z) or (E)

Different properties when difference in net polarities