What is the effect of molecular weight on melting and boiling points of alkanes?
Their melting and boiling points of alkanes are relatively low. The higher the molecular weight (the greater the number of carbons), the higher the boiling point.
What is the major use of alkanes?
Use of Alkanes Alkanes are important raw materials of the chemical industry and the principal constituent of gasoline and lubricating oils. Natural gas mainly contains methane and ethane and is used for heating and cooking purposes and for power utilities (gas turbines).
Why alkenes are called olefins?
UNSATURATED hydrocarbons contain either double or triple bonds. Since the compound is unsaturated with respect to hydrogen atoms, the extra electrons are shared between 2 carbon atoms forming double bonds in alkenes. Alkenes are also called OLEFINS because they form oily liquids on reaction with chlorine gas.
What is the general formula of olefins?
2 Olefins. Olefins are unsaturated compounds with a formula of CnH2n. The name of these compounds ends with –ene, such as ethene (ethylene) and propene (propylene).
Are alkynes olefins?
Alkenes (also called olefins) and alkynes (also called acetylenes) belong to the class of unsaturated… Olefins containing two to four carbon atoms per molecule are gaseous at ordinary temperatures and pressure; those containing five or more carbon atoms are usually liquid at ordinary temperatures.
Are alkanes olefins?
The alkanes are saturated hydrocarbons—that is, hydrocarbons that contain only single bonds. Alkenes contain one or more carbon-carbon double bonds. Alkynes contain one or more carbon-carbon triple bonds. Aromatic hydrocarbons contain ring structures with delocalized π electron systems.
What is the simplest olefin?
The simplest alkenes, with only one double bond and no other functional groups, form a homologous series of hydrocarbons with the general formula CnH2n. The two simplest alkenes of this series are ethylene and propylene. When these are polymerized, they form PE and PP.