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4 - Organic chemistry (d) Alkenes
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Total cards: 5•Content version: v3•Public deck•Updated: 8/1/2026
Card preview (5)
#1
Front (Question)
What is the general formula for alkenes?
Back (Answer)
CnH2n
#2
Front (Question)
What functional group do alkenes contain?
Back (Answer)
A carbon=carbon double bond (C=C).
#3
Front (Question)
Why are alkenes unsaturated?
Back (Answer)
Because they contain a double bond, meaning they could break it and have room for more hydrogens.
#4
Front (Question)
What is the reaction of alkenes with bromine?
Back (Answer)
It produces dibromoalkanes. The double bond will break and the spare spots will be taken up by the two bromine molecules (As Br is diatomic).
#5
Front (Question)
How can bromine water be used to distinguish between an alkane and alkene?
Back (Answer)
Add bromine water to the substance. If the bromine water turns colourless, it is an alkene. If it remains orange-brown it is an alkane.