Alcohols
5 marks · EasyAlcohols are used as biofuels. This question is about naming alcohols and their reactions.
Give the IUPAC name for the alcohol with the structural formula CH3CH2CH2OH.
State the homologous series to which ethanol belongs.
Write the word equation for the complete combustion of ethanol.
State one advantage of using ethanol as a fuel.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) propan-1-ol · must show Correct IUPAC name from structure
(b) alcohols · must show Homologous series alcohols
(c) ethanol + oxygen → carbon dioxide + water · must show Both reactants (ethanol and oxygen), Both products (carbon dioxide and water)
(d) renewable/biofuel/less reliance on fossil fuel · must show Valid advantage (e.g. renewable, less polluting, produced from plants, etc.)
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Gives correct IUPAC name for CH3CH2CH2OH (propan-1-ol or propanol).
B2 (b) · 1 mark · States 'alcohols' as the homologous series of ethanol.
B3 (c) · 1 mark · Gives both correct reactants (ethanol and oxygen) or both correct products (carbon dioxide and water) in the word equation.
B4 (c) · 1 mark · Gives a fully correct and complete word equation for ethanol combustion.
B5 (d) · 1 mark · States a relevant advantage (e.g. renewable, made from plants, reduces fossil fuel use, etc.).
Worked solution
a) CH3CH2CH2OH is named propan-1-ol (or just propanol).
b) Ethanol belongs to the homologous series called alcohols.
c) Ethanol + oxygen → carbon dioxide + water
d) Advantage: Ethanol is renewable as it can be made from plants (biofuel), or it reduces the use of fossil fuels.