Tên thông thường:
$C_2H_4$: etilen
$C_3H_6$: propilen
$C_4H_8$: butilen
$C_5H_10$: pentilen
Tên hệ thống
+$C_2H_4$: eten.
+$C_3H_6$: propen
+$CH_2=CH-CH_2-CH_3$: but-1-en,
$CH_3-CH=CH-CH_3$: but-1-en.
+$CH_2=CH-CH_2-CH_2-CH_3$: pent-1-en,
$CH_3-CH=CH-CH_2-CH_3$: pent-2-en,
$CH_2=(CH-CH_3)-CH_2-CH_3$: 2-metylbut-1-en
$CH_2=CH-(CH-CH_3)-CH_3$: 3-metylbut-1-en
$CH_3-(C-CH_3)=CH-CH_3$: 2-metylbut-2-en
