organic chemistry - reactions of alkenes

Question 1

why do all alkenes react in a similar way?

Answer 1

due to double bond

Question 2

what is a functional group?

Answer 2

part of a molecule that determines how it reacts

Question 3

functional group of alkenes

Answer 3

C=C (homologous group)

Question 4

what do members of a homologous series all have?

Answer 4

same functional group. each molecule in a homologous series has an extra carbon atom 2 extra hydrogen atoms

Question 5

what happens when we combust alkenes?

Answer 5

produce carbon dioxide and water. also produces unburnt carbon particles due to incomplete combustion. they produce smoky flame when burnt in the air

Question 6

what happens during hydrogenation?

Answer 6

an alkene reacts with hydrogen to produce an alkane
(double bond turns to single bond)

Question 7

what is the reaction between an alkene and water called?

Answer 7

hydration

Question 8

what happens during hydration?

Answer 8

an alkene and water react to form an alcohol

Question 9

in hydration what must the form of water be in? temperature + pressure?

Answer 9

steam
around 300 degrees
70 atmospheres

Question 10

what catalyst is used in hydration?

Answer 10

a phosphoric acid

Question 11

hydration is a _______________

Answer 11

reversible reaction

Question 12

how do we increase the yield of the alcohol in hydration?

Answer 12

any unreacted alkene and steam are passed back through the catalyst

Question 13

how fast is reaction between alkene and halogens?

Answer 13

rapid

Question 14

alkene + halogen -> ?
ethene + chlorine ->

Answer 14

di…..
dichloroethane
double carbon bonds turns to single bond

Question 15

ethen + bromine ->
ethene + iodine ->

Answer 15

dibromoethane
diiodoethane