3.4 Alkenes Flashcards
1
Q
Property of alkenes
A
Unsaturated hydrocarbon
High electron density (pi bond) at double bond
2
Q
Electrophilic addition
A
Accepts electrons Reacts with HBr Br2 H2SO4 Makes alcohols or hydrocarbon Can make induced dipole sometimes Carbonation at intermediate step
3
Q
Electrophilic addition for asymmetric alkenes
A
Major product made from more stable secondary/tertiary carbocation instead of primary cation
4
Q
Addition Polymerization
A
- break c=c bond, create repeating unit
- BRANCHED if high pressure, high temp
5
Q
Boiling point of polymers
A
if more contact points (denser) then strong intermolecular forces
need lot of energy to break
6
Q
Properties of Addition Polymerization
and Uses
A
unreactive (no double bonds)
so not biodegradable
Used for Plastic bags, PVC (waterproof) by adding plasticiser
7
Q
Calculating number of C=C bonds
A
- titrate bromine water
- until becomes orange
- mole of alkene/mole of bromine
8
Q
Saturating Alkenes
A
add hydrogen with a nickel catalyst
