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CH2 = CH - CH2 - CH2 - CH2 - CH2 - CH3
= 1-Heptena
CH3 - CH = CH - CH2 - CH2 - CH2 - CH3
= 2-Heptena
CH3 - CH2 - CH = CH - CH2 - CH2 - CH3
= 3-Heptena
maksdnya ini ?