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(To the molecules in three dimensions, you need to rasmol. Use this link to download rasmol windows )

Isomers: organic compounds have the same molecular formula but different structural formulas.


flat structural isomerism: Isomerism

chain: compounds differ only in the carbon chain.

C 5 H 12
Pentane	methylbutane	dimethylpropane
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position isomerism: the compounds have the same functional group but in different positions of the carbon chain.

C 5 H 10 O
Penta-3-one	Penta-2-one
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function isomerism: the compounds have different functional groups. An example is isomers between alcohol and ether.

C 3 H 8 O
Propan-2-ol	Etilmetileter
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Another case of isomerism function is between carboxylic acids and esters.

C 3 H 6 O 2
	propanoic acid methyl ethanoate	methanoate of ethyl
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