3.3.4 Alkenes Flashcards
(9 cards)
1
Q
why’s there an attraction between a C=C double bond and Br2?
A
- high electron density
- Br-Br becomes polarised
- partially + Br attracted to C=C
2
Q
what would happen if bromine water was added to a polyalkene?
A
- no reaction
- no double bonds present
3
Q
why’s more of an isomer formed in electrophilic addition?
A
- secondary carbocation more stable than primary
- the isomer will be more stable than the other one
4
Q
what reagent could react with but-1-ene and similars?
A
H-Br
5
Q
what’s an addition reaction?
A
a reaction converting a double bond to a single bond
6
Q
why does but-1-ene not exhibit stereoisomerism?
A
has 2 hydrogen atoms on the same carbon atom of the c=c bond
7
Q
why does stereoisomerism occur in but-2-ene?
A
- restricted rotation around the C=C bond
- has E and Z isomers
8
Q
what ion cannot act as an electrophile?
A
Cl-
9
Q
out of alkanes, alkenes and cycloalkanes which one has the highest Mr?
A
alkanes
