Răspuns :
C-C-C-C-C --(>650oC)--> C=C-C-C-C
1-pentena
C-C=C-C-C
2-pentena (cis si trans)
--(<650Oc)--> C=C-C-C + CH4
1-butena
C-C=C-C + CH4
2-butena (cis si trans)
C=C-C + C-C
propena etan
C=C + C-C-C
etena propan
C-C-C-C-C --(>650oC)--> C=C-C-C-C
1-pentena
C-C=C-C-C
2-pentena (cis si trans)
--(<650Oc)--> C=C-C-C + CH4
1-butena
C-C=C-C + CH4
2-butena (cis si trans)
C=C-C + C-C
propena etan
C=C + C-C-C
etena propan