Alkenes And Their Reactions Flashcards
Are alkenes saturated or unsaturated and why?
They are unsaturated because they have a double carbon-carbon bond which means they have 2 fewer hydrogen’s compared with the alkanes containing the same number of carbons
What can happen with the c=c double bond
It can open up to make a single bond allowing the 2 carbon atoms to bond with the other atoms
Making the alkenes a lot more reactive than alkanes
What are the first 4 alkenes in order
Ethene
Propene
Butene
Pentene
What is the general formula for alkenes
CnH2n
What happens when alkenes are in a large amount of oxygen
They combust completely to produce only water and carbon dioxide
What happens when you burn alkenes in air
They tend to undergo incomplete combustion
The co2 and water are still produces but carbon and carbon monoxide are also produced
Carbon monoxide is a poisonous gas
What’s the standard equation of incomplete combustion
Alkene + oxygen > carbon + carbon monoxide + co2 + h2o
What’s the results of incomplete combustion
A smoky yellow flame and less energy is released
What is a functional group
A group of atoms in a molecule that determines how that molecule typically reacts
What is the functional group of alkenes
C=C
What are the Normal reactions alkenes go under
Addition reactions
What is an addition reaction in alkenes
When the carbon-carbon double bond opens up to leave a single bond and a new atom is added to each carbon
What happens to an alkene when hydrogen reacts with it
It opens up the double bind and forms the equivalent saturated alkane
What will alkenes react with in addition reactions
Halogens like bromine chkorine and iodine
What happens when alkenes react with halogens
They become saturated and the c=c carbons each become bonded to a halogen atom
