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Worksheet: Substitution Reactions of Alkanes


In the substitution reaction of methane and a halogen, which of the following halogens is the most reactive?

  • A Bromine
  • B Chlorine
  • C Iodine
  • DFluorine


The substitution reaction between methane and fluorine gases is represented by the equation: The bond enthalpies of the reactants and products are listed in the table.

Bond C F C H F F H F
Bond Enthalpy (kJ/mol) 485 411 155 565

What is the enthalpy change for the substitution reaction?


What is a substitution reaction?

  • A A reaction in which two molecules combine to form a larger molecule, with no by-products
  • B A reaction in which one reactant is substituted for another
  • C A reaction in which one molecule breaks into two smaller molecules
  • D A reaction in which one part of a molecule is swapped with a part of another molecule
  • E A reaction in which the atoms in a molecule rearrange to form a different molecule with the same molecular formula