alkene	Nr carbon atoms	Melting Points °C	Boiling points °C	Density g/L
1 methene	1	na	na	na
2 Ethene	2	-169	-104.0	1.2
3 Propene	3	-185	-47.0	1.8
4 1-Butene	4	-185	-6.5	2.4
5 1-Pentene	5	-165	30.0	0.6
6 1-hexene	6	-140	63.0	0.7
7 1-Heptene	7	-119	94.0	0.7
8 1-Octene	8	-101.9	122.0	0.7
9 3-Nonene	9	-81.4	147.0	0.7
10 5-Decene	10	-66.3	170.0	0.7