Alkenes Flashcards
(8 cards)
1
Q
What is a pi bond
A
A pi bond is a bond formed by the sideways overlap of two p-orbitals, with the electron density above and below the plane of the bonding atoms
2
Q
What is a sigma bond
A
A sigma bond is formed when two s orbitals overlap in a straight line
3
Q
General formula of alkene
A
CnH2n
4
Q
Why are alkenes describe as unsaturated
A
Alkenes consist of one or more carbon-carbon double bonds
5
Q
Explain the high reactivity of alkenes
A
- High electron density makes the pi electrons highly accessible for reactions
- The pi bond sticks out above and below the rest of the molecule, allowing electrophiles to attack the pi electrons
- Its lower bond enthalpy requires less energy to break compared to sigma bonds
6
Q
General formula of cyclic alkenes
A
CnH2n-2
7
Q
Explain how p-orbitals are involved in the formation of the C=C double bond
A
Overlap of adjacent p-orbitals
- Diagram
8
Q
Suggest why 2-methylbut-2-ene is less soluble in water than either of its structural isomers formed
A
Does not contain -OH groups so doesn’t form hydrogen bonds with water
