Some chemical reactions of organic compounds
4 marks · NormalClassify the reaction types for the following organic processes and justify your answers.
Ethanol reacts with oxygen to produce carbon dioxide and water.
Ethane reacts with chlorine in the presence of sunlight to form chloroethane and hydrogen chloride.
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(a) Combustion. Ethanol reacts with oxygen to release energy, producing carbon dioxide and water. This is typical of combustion reactions. · must show Type: combustion, Reason: reacts with oxygen to make CO2 and H2O
(b) Substitution. Ethane has a hydrogen atom replaced by a chlorine atom, forming chloroethane and hydrogen chloride. This is a substitution reaction. · must show Type: substitution, Reason: hydrogen atom is replaced by chlorine
Must show: State of reaction type, Justification (evidence from reactants/products)
Common mistakes: Not including justification; Calling reaction addition
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Marking points
B1 (a) · 1 mark · States reaction type: combustion.
M1 (a) · 1 mark · Gives reasoning based on reactants and products (oxygen plus organic, products include CO2 and H2O).
B1 (b) · 1 mark · States reaction type: substitution.
M1 (b) · 1 mark · Explains that hydrogen atom is replaced by chlorine atom.
Worked solution
a) Combustion. Ethanol reacts with oxygen and forms CO2 and H2O, typical for combustion.
b) Substitution. In ethane, a hydrogen is substituted for chlorine, making chloroethane and HCl.