alkenes

Question 1

what are alkenes

Answer 1

unsaturated hydrocarbons that contain at least 1 double carbon bond with formula cnH2n

Question 2

why are the c-h bonds in alkanes partially negative

Answer 2

due to direct overlap of electron clouds belonging to each carbon atom

Question 3

what does the carbon double bond in alkenes have

Answer 3

they contain both partial negative bonds so they have a High electron density and can react with electrophiles

Question 4

how is stereoisomerism presented in alkenes

Answer 4

due to restricted rotation around the planar double carbon bond

Question 5

what does bonding in alkene involve

Answer 5

double carbon bond, a centre of high electron density

Question 6

what does electrophilic addition of alkenes react with

Answer 6

HBR, H2SO4, BR2

Question 7

what is an electrophile

Answer 7

electron pair acceptor to areas of high electron density of the double carbon bond

Question 8

how to test for unsaturation

Answer 8

bromine water acts as a test, unsaturated compounds will decolourise the bromine water as a dihaloalkane will form using uo the bromine

Question 9

what happens when unsymmetrical alkenes all react

Answer 9

the major product will form stable carbocation immediate with the most alkali group attached to it