Alkenes

Question 1

what are alkenes?

Answer 1

unsaturated hydrocarbons

Question 2

whats the general formula for alkenes?

Answer 2

CnH2n

Question 3

what bond do alkenes contain?

Answer 3

a carbon- carbon double bond somewhere in their structure

Question 4

what is the angles and shape around the arrangement of bonds around the >C=C?

Answer 4

its planar and has the bond angle 120 degrees

Question 5

what are the bonds in a C=C double covalent bond?

Answer 5

C=C double covalent bond consists of one sigma bond and one pi bond

Question 6

how do the properties of pi bonds relate to its function?

Answer 6

• pi bonds are exposed and have high electron density

- they are therefore vulnerable to attack by species which ‘like; electrons: these species are called electrophiles

Question 7

define sterioisomerers

Answer 7

stereoisomers have the same structural formulae but have a different spatial arrangement of atoms

Question 8

why type of isomerism do alkenes exhibit?

Answer 8

E-Z sterioisomerism

Question 9

why do alkenes display E-Z isomerism?

Answer 9

E-Z isomers exist due to restricted rotation about the C=C bond

Question 10

when do E-Z stereoisomers arise?

Answer 10

1) when there is restricted rotation around the C=C double bond
2) the are 2 different groups/atoms attached both ends of the double bond