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4.1.3 alkenes

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

what is the reagent in a reaction between hydrogen and an alkene ?

Back (Answer)

hydrogen

#2
Front (Question)

what catalyst is needed in a reaction between hydrogen and an alkene?

Back (Answer)

nickel

#3
Front (Question)

give the basic product of a reaction between hydrogen and an alkene?

Back (Answer)

alkane

#4
Front (Question)

what is the reagent in a reaction between a halogen and an alkene?

Back (Answer)

halogen

#5
Front (Question)

give the basic product of a reaction between a halogen and an alkene

Back (Answer)

dihaloalkane

#6
Front (Question)

what is the test to test for alkenes and what is the outcome

Back (Answer)

reaction with bromine water where alkenes decolourise bromine water

#7
Front (Question)

what is the reagent in a reaction between a hydrogen halide and an alkene

Back (Answer)

hydrogen halide

#8
Front (Question)

what is hydration

Back (Answer)

addition of water to a molecule

#9
Front (Question)

give the three conditions needed for a reaction between an alkene and steam

Back (Answer)

• H3PO4 catalyst • 300°C • 60atm

#10
Front (Question)

what is the reagent in a reaction between an alkene and steam

Back (Answer)

steam

#11
Front (Question)

what type of reaction is the reaction between an alkene and steam

Back (Answer)

reversible

#12
Front (Question)

give the product of a reaction between an alkene and steam

Back (Answer)

alcohol

#13
Front (Question)

define alkene

Back (Answer)

unsaturated hydrocarbons contain at least one carbon to carbon double bond

#14
Front (Question)

give the shape and bond angle of a c=c bond

Back (Answer)

trigonal planar 120°

#15
Front (Question)

what two bonds are c=c bonds made up of

Back (Answer)

sigma and pi bonds

#16
Front (Question)

why are pi bonds vulnerable to attack from electrophiles

Back (Answer)

they are exposed and have high electron density

#17
Front (Question)

how is the pi bond formed

Back (Answer)

sideways overlap if two p orbitals on each carbon atom forming a pi bond above and below the plane of the molecule

#18
Front (Question)

which bond is weaker sigma or pi

Back (Answer)

pi

#19
Front (Question)

alkenes induce strong dipoles on which molecules

Back (Answer)

halogens

#20
Front (Question)

what is stereoisomerism

Back (Answer)

molecules that have the same structural formula but a different spacial arrangement of atoms

#21
Front (Question)

what kind of isomerism do alkenes exhibit

Back (Answer)

e-z

#22
Front (Question)

why do stereoisomers arise

Back (Answer)

• there is restricted rotation around the c=c double bond * there are two different groups/atoms attached to both ends of the restricted double bond

#23
Front (Question)

give the steps of the cahn-ingold prelog rules

Back (Answer)

1) split in the middle 2) which atom or group of atoms has higher atomic number

#24
Front (Question)

why do cis-trans isomers arise

Back (Answer)

• if the alkene has two groups/atoms that are the same each side of the double bond • if two groups are in the same plane the molecule is called cis and if not trans