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Isomers are molecules with the same molecular formula but different structural formulas. Here are some examples:
Structural Isomers:
Butane (C4H10):
n-butane (straight chain): CH3CH2CH2CH3
isobutane (branched chain): CH3CH(CH3)CH3
Pentane (C5H12):
n-pentane: CH3CH2CH2CH2CH3
isopentane: CH3CH(CH3)CH2CH3
neopentane: CH3C(CH3)3
Geometric Isomers (Cis-Trans):
2-butene (C4H8):
cis-2-butene:
H and CH3 groups on the same side of the double bond
trans-2-butene:
H and CH3 groups on opposite sides of the double bond
Enantiomers (Optical Isomers):
2-chlorobutane (C4H9Cl):
(R)-2-chlorobutane:
Chiral center with a clockwise arrangement of groups (R configuration)
(S)-2-chlorobutane:
Chiral center with a counterclockwise arrangement of groups (S configuration)
These are just a few examples of isomers. The number and types of isomers increase with the complexity of the molecule.