Saved Bookmarks
| 1. |
What is the pyrolysis of alkane ? Give reaction. |
|
Answer» Solution :Defination higher alkanes on heating to higher temperature decompose into lower alkanes, alkenes etc. Such a decomposition reaction into smaller fragements by the application of heat I called pyrolysis or craking. Higher alkane `underset("Pyrolysis")overset("Higher temperature")rarr (("Lower alkane"),("alkane mixture"))` Example -1 : Pyrolisis of hexane  Example -2 : Pyrolysis of alkynes is believed to be a free radical reaction. Preparation of oil gas or petrol gas from kerosene oil or petrol involves the principle of pyrolysis. For example, dodecane, a constituent of kerosene oil on heating to 973K in the presence of platinum, palladium or nickel gives a mixture of heptane and pentene. `underset("Kerosene")underset("Dodecabe")(C_(12)H_(26))underset(973 K)overset("Pd, PT, Ni")rarr underset("(Alkane)")underset("Heptane")(C_(7)H_(10)) + underset("(Alkene)")underset("Pentene")(C_(5)H_(10))+ underset("Products")("Other")` Thermal combusiton of alkane fission is free radical type reaction. THis type of mixer of HYDROCARBON is mixture of less carbon (Alkane + Alkene) |
|