alkenes and polymers Flashcards
1
Q
which is stronger pi or sigma bond and why
A
sigma
between 2 nuclei
2
Q
trans / E
A
opposite sides
3
Q
cis / Z
A
same side
4
Q
define electrophile
A
an electron deficient species with a vacant orbital often positively charged
5
Q
define addition reaction
A
where one or more groups are added on to a molecule to give a single product
6
Q
how can the stability of the carbocation intermediate be increased
A
methyl groups are weakly electro donating so the stability increases as the number of methyl groups attached to C+ increases
7
Q
test for unsaturation
A
bromine water + ethene/propene
shake together/bubble gas through
orange bromine water decolourised
8
Q
what is required for polymerisation
A
any short chain alkene
high pressure
peroxide initiator that produces free radicals
