Chapter 8 Notes | Chemistry 2nd Year
- Hydrocarbons are made up of carbon and hydrogen only. Saturated hydrocarbons are called alkanes. They do not contain functional groups.
- Alkanes react with halogen by a radical mechanism ti give haloalkanes mechanism consists of three steps, initiation, propagation and termination.
- Alkenes are very reactive compounds. They undergo electroscopic reactions easily.
- Addition of unsymmetrical reagent to an unsymmetrical alken takes place accordance with the Markownikov’s rule.
- Hydrocarbons containing a triple bond are known as alkynes or acetylenes.
- Alkynes underho addition reaction and two molecules of a reagent are added in it.
- Etyne and other terminal alkynes contain a weakly acidic hydrogen and therreact with ammocial cupprous chloride and ammocial silver nitrate to give acetylide.
- The decreasing reactivity order alkanes, alkenes and alkynes are as follows: