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REACTIONS OF ALKENES
HALOGENS REACTION WITH ALKENES
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HALOGENS REACTION WITH ALKENES:
RAPID
reaction
No
CATALYST
needed
CHLORINE REACTION:
Carbon to carbon
DOUBLE
bond- becomes a
carbon
to carbon
SINGLE
bond (bond
BROKEN
)
CHLORINE molecule-
feed
across
SINGLE
bond
GENERAL EQUATION: CHLORINE
ALKENE +
CHLORINE
->
DICHLORO
(
ALKANE
)
BROMINE AND IODINE REACT IN THE SAME WAY:
ALKENE +
BROMINE
->
DIBROMO
(
ALKANE
)
ALKENE +
IODINE
->
DIIODO
(
ALKANE
)
HOW CAN THE REACTION WITH BROMINE BE USED TO DISTINGUISH BETWEEN ALKENES AND ALKANES?
Alkenes-
DOUBLE
bond- more
REACTIVE
than
ALKANES
(when added to
BROMINE-
colour change from
ORANGE
to
COLOURLESS
)
Alkanes-
SATURATED
(no
DOUBLE
bonds) - have no
REACTION
with
BROMINE