alkenes Flashcards
1
Q
alkenes
A
unsaturated hydrocarbons
2
Q
general formula for alkenes
A
CnH2n
3
Q
what does a C=C double covalent bond consist of?
A
one sigma bond and one pi bond
4
Q
pi bonds
A
- are exposed and have high electron density
- they are therefore vulnerable to attack by species which like electrons (electrophiles)
5
Q
formation of a sigma bond
A
one sp2 orbital from each carbon overlap to form C-C bond called a sigma bond
rotation can occur around a sigma bond
6
Q
formation of the pi bond
A
tsideways overlap of two p orbitals on each carbon arom orming a pi bond aboce and below the plane of the molecule - above and below is one pi bond
the pi bond is weaker than the sigma bond
there is restricted rotation around the pi bond
