4806540
Description
Flashcards by Bee Brittain, updated more than 1 year ago
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Created by Bee Brittain
over 8 years ago
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| Question | Answer |
| What are alkenes described as? What characteristic gives them this name? | Alkenes are described as 'unsaturated hydrocarbons'. This is because they have a double bond. |
| How many regions of electron density are there around each carbon atom? | There are 3 regions of electron density. |
| What is the bond angle around each carbon atom in a double bond and why? | The bond angle is 120 degrees, this is because of the three regions of electron density that repel each other as far as possible. |
| Can the atoms around a double bond rotate? Explain. | No, this is due to the two pi-bonds that are on each side of the sigma bond, locking the atoms in place and preventing them from rotation around the double bond. |
| State what is meant by the term 'unsaturated' | Unsaturated mean that there is a double bond, or there could be more than one double bond. |
| What is the molecular formula, and the name, of the alkene that contains 5 carbons, with the double bond between carbons 2 and 3, and a chlorine on carbon 1. | Name: 1-chloropent-2-ene Molecular Formula: C5H9Cl |
| What is the difference between a sigma bond, and a pi bond? | A sigma bond is directly between the two carbon atoms, it is a head on overlap of orbitals, whereas the two pi bonds are above and below the sigma bond and are a sideways overlap of p-orbitals. |
| Define Stereoisomerism | When two isomers have the same structural formula, but a different arrangement in space. |
| What conditions are needed for an isomer to be an E/Z Isomer? | - A C=C double bond. - Different groups attached to each C atom of the double bond. |
| If something is an E isomer, what does this mean? | The highest priority groups are diagonally across from each other. |
| If something is a Z Isomer, what does this mean? | The highest priority groups are on the same side of the double bond. |
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