alkenes Flashcards
why is there no rotation around the C=C bond
due to the pi bond, the double bond is an electron dense region to hold the carbon atoms in place
what is an electrophile
electron pair acceptor
description of the reaction between bromine and alkene
reagent: bromine
condition: room temp
mechinism: electrophillic addition
what is the test for unsaturation
add bromine water, observe colour change from orange to colourless
properties of poly(ethene)
layers can pack closely together, has strong IM forces and therefore a stronger and more rigid material
properties of poly(phenylethene)
has a large phenyl branch which disrupts the IM forces, layers cant pack closely together making it more flexible
use of pvc
drainpipes, vinyl and aprons
use of pvc with plasticiser
electrical cable insulation flooring tiles and clothing
how can alkenes from addition polymers
the C=C double bond breaks open
why is a secondary carbocation more stable than a primary carbocation
secondary carbocations have more alkyl groups which have a positive inductive effect and push the electrons onto the C+ making it more stable
what is plasticiser
it is added to make a polymer more flexible by reducing IM forces so chains can move around more
what is the difference between saturated and unsaturated
saturated: only having single carbon bonds
unsaturated: having double bonds aswell as single
addition polymers
formed from alkenes
they are unreactive
ethene -> poly(ethene)
represented with brackets with visible broken bonds
