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1941810
elimination reaction of haloalkanes
Description
aqa as level chemistry unit 2- organics
Mind Map by
Pia Ricioppo
, updated more than 1 year ago
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Created by
Pia Ricioppo
over 9 years ago
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Resource summary
elimination reaction of haloalkanes
the reagent for this reaction is ALCOHOLIC sodium or potassium hydroxide.
the conditions need to be reflux in alcoholic solution.
the product produced is an ALKENE.
for example bromopropane and sodium hydroxide...
key points
OH- acts as a base (proton acceptor)
protons come from carbon or the hydrogen ion next to the carbon bonded with halogen
electron pair moves to form a second bond (double bond) between the carbon atom
the halogens displaced
overall theres an elimination of HBR
what decides whether you get an elimination or a substituition?
one very important factor is the type of haloalkane...
primary
mainly substituition
secondary
substituition and eliminaion
teritary
mainly elimination
the solvent
the proportion of solvent to ethanol MATTERS.
water encourages substituition
ethanol encourages elimination
higher temperatures encourage elimination.
concentration of sodium or potassium hydroxide solution
higher concentrations favour elimination
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