Halogenoalkanes

Question 1

Halogenoalkanes from alkanes

Answer 1

Radical substitution

Question 2

Halogenoalkanes from alkenes

Answer 2

Electrophyllic addition

Question 3

Reactions of halogenoalkanes

Answer 3

Elimination

Substitution

Question 4

Reflux reaction uses a..

Answer 4

Reflux condenser

Question 5

NaOH(aq) + HNO3(aq) + AgNO3(aq) with chloroalkane, bromoalkane and iodoalkane

Answer 5

Chloroalkane = white ppt dissolves in dilute ammonia solution
Bromoalkane = cream ppt dissolves in concentrated ammonia solution
Iodoalkane = primrose yellow ppt doesn't dissolve in ammonia solution

Question 6

Rate of hydrolysis

Answer 6

Iodo>bromo>chloro

As C-Cl is most polar (stronger bonds to break)

Question 7

CFCs were used as propellants, effect on ozone layer

Answer 7

C-Cl bonds broken by UV light:
Cl•+O3-->ClO•+O2
UV light in upper atmosphere breaks down O2:
O2-->2O
React with radicals:
ClO•+O-->O2+Cl•

Question 8

CFCs replaces with…

Answer 8

HCFCs