Chemistry Video Notes
ALKENE ALKYNES ARENES
Hydrocarbons
(ALKENE)
, Didn’t understand? Watch
ALKENES the video (Click Here)
Alkenes are a class of hydrocarbons (e.g, containing only carbon and hydrogen)
unsaturated compounds with at least one carbon-to-carbon double bond.
Another term used to describe alkenes is olefins. Alkenes are more reactive
than alkanes due to the presence of the double bond
Ethane Ethene
Alkenes-Nomenclature
Identify the longest carbon chain
that contains the double bond. Geometric isomers
It have the same molecular formula and
structure, but the arrangement of atoms
CH2=CH-CH=CH2 is different.
but-1,3-diene
Didn’t understand? Watch
the video (Click Here)
Alkenes: Preparation: From Alkynes
Partial Reduction of Alkynes Addition of "H" using Lindlar's Catalyst.
Lindlar's Catalyst is Partially deactivated palladised charcoal
Palladised charcoal = Palladium metal supported on charcoal
Partially deactivated by poisons Quinoline,Sulphur compounds
Alkenes: Preparation: From Alkynes
Alkynes on reduction with Lindlar's reagent form Cis alkenes
Alkynes on reduction with Sodium in liquid ammonia form Trans alkenes
ALKENE ALKYNES ARENES
Hydrocarbons
(ALKENE)
, Didn’t understand? Watch
ALKENES the video (Click Here)
Alkenes are a class of hydrocarbons (e.g, containing only carbon and hydrogen)
unsaturated compounds with at least one carbon-to-carbon double bond.
Another term used to describe alkenes is olefins. Alkenes are more reactive
than alkanes due to the presence of the double bond
Ethane Ethene
Alkenes-Nomenclature
Identify the longest carbon chain
that contains the double bond. Geometric isomers
It have the same molecular formula and
structure, but the arrangement of atoms
CH2=CH-CH=CH2 is different.
but-1,3-diene
Didn’t understand? Watch
the video (Click Here)
Alkenes: Preparation: From Alkynes
Partial Reduction of Alkynes Addition of "H" using Lindlar's Catalyst.
Lindlar's Catalyst is Partially deactivated palladised charcoal
Palladised charcoal = Palladium metal supported on charcoal
Partially deactivated by poisons Quinoline,Sulphur compounds
Alkenes: Preparation: From Alkynes
Alkynes on reduction with Lindlar's reagent form Cis alkenes
Alkynes on reduction with Sodium in liquid ammonia form Trans alkenes
