Worksheet: Substitution Reactions of Alkanes

In this worksheet, we will practice defining substitution reactions and writing and interpreting equations for substitutions of alkanes with halogens.

Q1:

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

  • AChlorine
  • BFluorine
  • CIodine
  • DBromine

Q2:

The substitution reaction between methane and fluorine gases is represented by the following equation. CH+FCHF+HF423 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?

Q3:

What is a substitution reaction?

  • AA reaction in which one molecule breaks into two smaller molecules
  • BA reaction in which one reactant is substituted for another
  • CA reaction in which one part of a molecule is swapped with a part of another molecule
  • DA reaction in which the atoms in a molecule rearrange to form a different molecule with the same molecular formula
  • EA reaction in which two molecules combine to form a larger molecule, with no by-products

Q4:

Which of the following substitution reactions is slowest at room temperature and pressure?

  • A
  • B
  • C
  • D

Q5:

When ethane and bromine are mixed and illuminated by ultraviolet light, they react together in a substitution reaction. The incomplete balanced equation for this reaction is: CH+BrX+HBr262. Determine the stoichiometry and molecular formula of the product X.

  • A C H B r 2 4 2
  • B C B r 2 6
  • C C H B r 2 5
  • D 2 C B r 4
  • E 2 C H B r 3

Q6:

Which two species can form 2-methylpropane via a Grignard reaction?

  • AFormic acid and bromomethane
  • BWater and 2-bromopropane
  • CFormaldehyde and bromomethane
  • DMethanol and 2-bromopropane
  • EWater and 2-bromo-2-methylpropane

Q7:

How many products are formed in the monosubstitution reaction of butane and bromine?

Q8:

Which of the following products is produced in the monosubstitution reaction of propane and chlorine?

  • A 1 , 1 , 2 -Trichloropropane
  • B 1 , 2 , 2 -Trichloropropane
  • C1-Chloropropane
  • D 1 , 3 -Dichloropropane
  • E 1 , 2 -Dichloropropane

Q9:

How many functional groups does the following molecule have?

C C H 3 C H 3 C H 2 O H C H 2 C H 3

Q10:

Which catalyst is used for the halogen substitution reactions of alkanes?

  • AX-rays
  • BInfrared radiation
  • CConcentrated acid
  • DUltraviolet light
  • EFine nickel mesh

Q11:

Complete the equation. Ethane+chlorine+

  • Achloroethane, water
  • Bchloroethane, hydrogen
  • Cdichloromethane, hydrogen chloride
  • Ddichloroethane, hydrogen
  • Echloroethane, hydrogen chloride

Q12:

How many functional groups does the following molecule have?

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