Alkenes Flashcards
(30 cards)
What is the general formula for an Alkene?
CnH2n
What bonds are found in a C=C in an Alkene?
Pi bonds
How is a Pi bond formed and how does it differ from a sigma bond?
Pi bonds are formed when P orbitals overlap side by side
They can’t rotate
What is a structural isomer?
They have the same molecular formula but different structural formula
What is a stereoisomer?
Same structural formula but different arrangement in space
What is E isomerism?
The 2 priority groups are on different sides
What is Z isomerism?
The 2 priority groups are on the same side of the double bond
What is cis isomerism?
2 priority groups that are identical on the same side
What is trans isomerism?
2 priority groups that are identical on different sides
What is the reaction called when alkenes react with hydrogen?
Hydrogenation
What is formed in hydrogenation
Alkane
What are the reaction conditions of hydrogenation?
Nickel catalyst
150 degrees
60 atmos
What is it called when you react and Alkene and a halogen?
Halogenation
What is formed in halogenation?
Dihaloalkane
How can halogenation be used to test for unsaturation?
Orange bromine solution will turn colourless in the presence of an unsaturated Alkane
What is the general formula for an Alkene?
CnH2n
What bonds are found in a C=C in an Alkene?
Pi bonds
How is a Pi bond formed and how does it differ from a sigma bond?
Pi bonds are formed when P orbitals overlap side by side
They can’t rotate
What is a structural isomer?
They have the same molecular formula but different structural formula
What is a stereoisomer?
Same structural formula but different arrangement in space
What is E isomerism?
The 2 priority groups are on different sides
What is Z isomerism?
The 2 priority groups are on the same side of the double bond
What is cis isomerism?
2 priority groups that are identical on the same side
What is trans isomerism?
2 priority groups that are identical on different sides
