Reactions of Alkanes and Cycloalkanes There are two major types of reactions of alkanes and cycloalkanes: –Combustion Alkane + Oxygen Carbon dioxide + water + heat energy –Halogenation Alkane + Halogen Alkyl halide + hydrogen halide
Combustion Reactions General form: Alkane + oxygen carbon dioxide + water Examples CH 4 + 2O 2 CO 2 + 2H 2 O + 9O 2 6CO 2 + 6H 2 O
You Try These! Write the combustion reactions for the following alkanes and cycloalkanes. 1.Propane 2.Ethane 3.Cyclooctane
Answers to You Try These! 1. C 3 H 8 + 5O 2 3CO 2 + 4H 2 O 2. 2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O 3. C 8 H O 2 8CO 2 + 8H 2 O
Halogenation Reactions General Form: Alkane + Halogen Alkyl halide + Hydrogen halide Requires Heat or Light as a catalyst Examples: CH 4 + Br 2 CH 3 Br + HBr + Cl 2 + HCl Cl
You Try These! Write the equation for the following: 1.Ethane + chlorine 2.Propane + bromine 3.Cyclobutane + chlorine
Answers to You Try These! 1.CH 3 CH 3 + Cl 2 CH 3 CH 2 Cl + HCl 2.CH 3 CH 2 CH 3 + Br 2 CH 3 CHBrCH 3 +HBr OR CH 3 CH 2 CH 3 + Br 2 CH 3 CH 2 CH 2 Br +HBr 3. + Cl 2 + HCl Cl
Write a balanced equation for each reaction: A) complete combustion of cyclobutane B) monobromination of propane C) complete combustion of ethane D) monochlorination of butane
Write a balanced equation for each reaction: A) complete combustion of cyclobutane –2 C 4 H O 2 8 CO H 2 O + heat energy B) monobromination of propane –C 3 H 8 + Br 2 C 3 H 7 Br + HBr C) complete combustion of ethane –2 C 2 H O 2 4 CO H 2 O + heat energy D) monochlorination of butane –C 4 H 10 + Cl 2 C 4 H 9 Cl + HCl
Write a balanced equation for each reaction: A) complete combustion of decane B) monochlorination of cyclobutane C) monobromination of pentane D) complete combustion of hexane
Write a balanced equation for each reaction: A) complete combustion of decane –2 C 10 H O 2 20 CO H 2 O + heat energy B) monochlorination of cyclobutane –C 4 H 8 + Cl 2 C 4 H 7 Cl + HCl C) monobromination of pentane –C 5 H 12 + Br 2 C 5 H 11 Br + Hbr D) complete combustion of hexane –2 C 6 H O 2 12 CO H 2 O + heat energy
HOMEWORK Page 323 #11.59 & 11.60