Elimination reaction in halogenoalkanes Flashcards
What are the conditions needed for an elimination reaction to occur?
high temperature in ethanol
What does the OH- ion act as during an elimination reaction?
A base
What are the three products that form from an elimination reaction from halogenoalkanes?
Alkene, hydrogen halide and a water molecule
What is the reagent used in this reaction?
potassium hydroxide
Draw the mechanism for the reaction of 2-bromo-butane and potassium hydroxide
How could you test that an alkene was formed in this reaction?
Place the products in bromine water. If the water goes from orange to colourless then there is a carbon-carbon double bond present.
Which type of reaction do primary halogenalkanes favour?
substitution
Which type of reaction secondary halogenalkanes favour?
both substituation and elimination
Which type of reaction do tertiary halogenoalkanes favour?
Elimination
What are chloroflourocarbons also called?
CFCs
What are short chain chloroflourocarbons used for?
They are gases and so are used for making aerosol propellants, refrigerants and blowing agents
What do chloroflourocarbon compounds compose of?
chlorine, flourine and carbon (no hydrogen)
What are long chain chloroflourocarbons used for?
dry cleaning and de-greasing solvents
What happens to CFC gases up in the atmosphere?
They decompose to give chlorine atoms
What is the symbol for the ozone layer?
O3
