Alkenes Flashcards
(13 cards)
What is the general formula for alkenes
CnH2n
Why are alkenes more reactive than alkanes
The carbon carbon double bond has high electron density making electrons highly accessible
What is the name for the reaction where the cc double bond is broken
Electrophilic addition
Draw an electrophilic addition reaction between bromine and ethene
How to test for alkenes
Bromine water turns from orange to colourless
What are the conditions for hydration
Under the influence of a phosphoric(V) acid catalyst, alkenes react with steam at 300°C and 60-70 atm pressure
What is produced from hydration of alkenes
alcohols
Draw the hydration reaction mechanism
How do you predict the major product
More stable carbocations produce the major product. tertiary alcohols are the most stable and primary the least due to increased positive inductive effect
How do alkenes polymerise
opening their double bond to join end to end
draw a monomer and a repeating unit
how to name addition polymers
Take the name of the alkene monomer.
Enclose the monomer name in brackets.
Add the prefix “poly”.
What is a platisiser
small molecules that can be added to polymers to increase flexibility by position themselves between polymer chains.
This pushes the chains apart, weakening intermolecular forces so they can slide over each other when bent
