alkene

Question 1

what are alkene?

Answer 1

Alkenes have a general formula of C2nH2n and has a functional group of c=2 double bonds(1);so it is polyunsaturated

chemical reactions
1)halogenation
2)hydrogenation
3)hydration
4)polymerisation

Question 1

name the 10 alkene

Answer 1

1)-
2)ethene
3)propene
4)butene
5)pentene
6)hexene
7)heptene
8)octene
9)nonene
10)decene

Question 2

what is halogenation(bromination)?

Answer 2

It is used as a test for alkene when bromine is added reddish-brown sol turns colourless

ethene +bromine reation————–>dibromoenthane

Question 3

what is hydrogenation?

Answer 3

It is adding H2 at 150 temp,with finely divded nicle catalyst (converting alkene inot alkane)

ex:decene + h2 —?

Question 4

what is hydration?

Answer 4

hydration is the addition of steam at 300 temp,60 atm and H3po2 or H2SO4
(alkene into alcohol)

ethene+ steam——>enthanol

Question 5

manufacture of margrine from vegtable oil?

Answer 5

vegatble oil have is polyunsaturated and it have many C=C double bonds.Excess H2 is added at 150 temp with finely divided catatyst ,so that C=C double bond is lost an dmore c-c single bond,more staurated,so soild margarine