【正文】
H- C—— C—— C- H | | | H H H 丁烷 異丁烷 乙烷: H H 丙烷: H H H | | | | | H- C- C- H H- C- C- C- H | | | | | H H H H H 丁烷: H H H H 異丁烷: H | | | | | H- C- C- C- C- H HCH | | | | H H H H H H | | H- C—— C—— C- H | | | H H H 它們對應的結構簡式: CH3CH3 CH3CH2CH3 CH3CH2CH2CH3 CH3CH(CH3 )CH3 結構簡式書寫: 例: H H H H H | | | | | H— C— C— C— C— C— H | | | | | HH— CH H H H |