Structure and Reactivity of Alkenes

Question 1

What is the bonding angle in alkenes?

Answer 1

= 120 degrees

Question 2

Where are the sigma bonds in alkenes?

Answer 2

= between carbon and hydrogen atoms

Question 3

What 2 bonds does the double bind have?

Answer 3

= 1 sigma bonds between carbon atoms
= each carbon atom has 1 electon left in p orbital
= lie above and below plane of the molecule
= overlap sideways pi vbond

Question 4

What is the rotation of these 2 bonds?

Answer 4

= sigma: can rotate
= pi: cannot rotate - rotation would reudce the overlap of p orbital
=

Question 5

Are alkenes highly reactive?

Answer 5

= yes
= diuble covalnt bond is weak
= bond enthalpy of pi bond is less than sigma bonds
= pi is sideways overlap of orbitals
= sigma is a direct overlap pi bond is easier ti break
=