AQA Chemistry A-Level - 3.3.4 Alkenes Exam Study Verified Accurate Answers.
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Module
MCMURRY
Institution
MCMURRY
What are alkenes? - correct answer Unsaturated hydrocarbons, due to C=C double bond
What is the general formula for an alkene? - correct answer CnH2n
Why is there no rotation around the C=C double bond? - correct answer...
What are alkenes? - correct answer Unsaturated hydrocarbons, due to C=C double
bond
What is the general formula for an alkene? - correct answer CnH2n
Why is there no rotation around the C=C double bond? - correct answer Due to the
pi orbital above and below the bond, holding it in place.
Are they more or less reactive than alkanes? - correct answer More reactive, due to
the high electron density at the C=C double bond and because the pi bond is slightly easier to break.
What is the test for alkenes? - correct answer Bromine water; orange to colourless
Why are alkenes susceptible to attacks by electrophiles? - correct answer Due to
the high electron density in the double bond
What is a carbocation? - correct answer An organic ion containing a positively
charged carbon atom
What forms the major product of an electrophilic addition? - correct answer The
most stable carbocation
Reaction mechanism of an alkene to form a halogenoalkane - correct answer
Mechanism - Electrophilic addition
Reagents - HBr
Conditions - 20°C
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