M < 150
CxHy
C : 87,27% : 12 = 7,2725 | : 7,2725 = 1 |x 4 = 4
H : 12,73% : 1 = 12,73 |: 7,2725 = 1,75 | x 4 = 7
formula bruta : C4H7
(4·12 + 7·1)n < 150 55n < 150 ⇒ n < 3
ptr. n = 2 C8H14 NE = 2
CH3-CH2-CH2-HC≡CH-CH2-CH2-CH3 sau
H2C=CH-(CH2)4-CH=CH2sau....