ALKENA

Adalah:Senyawa hidrokarbon ikatan rangkap 2 ( C=C )
Rumus Umum : CnH2n
Deret Homolog Alkena:

C2H4 , CH2=CH2 Ethana
C3H6 , CH2=CH2-CH3 Propana
C4H8 , CH2=CH2-CH3 Buthana
C5H10 , CH2=CH2-CH2-CH3 Penthana Dst
C6H12 ,Hexana
C7H14 ,Heptana
C8H16 ,Oktana
C9H18 ,Nonana
C10H20 ,Dekana