Tuliskan rumus umum dari alkena

1
CH4
CH4
Metana
2
C2H6
CH3 – CH3
Etana
3
C3H8
CH3 – CH2 – CH3
Propana
4
C4H10
CH3 – (CH2)2 – CH3
Butana
5
C5H12
CH3 – (CH2)3 – CH3
Pentana
6
C6H14
CH3 – (CH2)4 – CH3
Heksana
7
C7H16
CH3 – (CH2)5 – CH3
Heptana
8
C8H18
CH3 – (CH2)6 – CH3
Oktana
9
C9H20
CH3 – (CH2)7 – CH3
Nonana
10
C10H22
CH3 – (CH2)8 – CH3
Dekana