isomerism
- Created by: Nataliagx
- Created on: 31-01-19 10:19
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- ISOMERISM
- structural isomer
- same molecular formula, but different arrangement of the atoms in space
- CHAIN ISOMERISM
- changing the position of branched chains
- POSITION ISMOERISM
- basic carbon chain stays same, but important groups move.
- FUNCTIONAL GROUP ISOMERISM
- same molecular formula but different functional groups
- stereoisomer
- same order of atoms, but different spatial arrangement
- GEOMETRIC
- restricted rotation
- no geometric isomers w/ 2 groups the same on one side of bond
- TRANS
- opposite sides of double bond
- PHYSICAL PROPERTY
- same side of double bond
- TRANS higher mp
- for IMF to work well, the molecules must pack together efficiently in the solid.
- Trans pack better than cis isomers
- poorer packing in cis= IMF not as effective; less energy is needed to melt the molecule
- Trans pack better than cis isomers
- for IMF to work well, the molecules must pack together efficiently in the solid.
- CIS high bp
- stronger IMF between the molecules of cis than the trans isomer
- cis isomer is POLAR and trans isn't
- DIPOLE-DIPOLE INTRACTNS as well as LDN FORCES
- more energy needed to break these forces
- DIPOLE-DIPOLE INTRACTNS as well as LDN FORCES
- cis isomer is POLAR and trans isn't
- stronger IMF between the molecules of cis than the trans isomer
- PHYSICAL PROPERTY
- opposite sides of double bond
- CIS
- same side of double bond
- OPTICAL ISOMERISM
- chiral carbon produces enoniometers that rotate plane of polarised light in opposite directions
- If the solutions equally concentrated, amount of rotation by two isomers is the same but in opposite directions
- (+)
- rotates the plane of polarisation in clockwise
- (-)
- rotates the plane of polarisation anti-clockwise
- chiral carbon produces enoniometers that rotate plane of polarised light in opposite directions
- structural isomer
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