Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
411–420 of 785
Question 411
6 marks · Normal
Answer and see the solution →(a)[2 marks]A student finds that a colourless, flammable liquid decolourises bromine water and burns with a smoky flame.
Explain what these two observations tell you about the type of hydrocarbon present.
(b)[2 marks]The student tests another liquid and observes that it does not decolourise bromine water and burns with a clean flame.
What type of hydrocarbon is this? Explain your reasoning.
(c)[2 marks]Write the displayed formula for but-1-ene, the alkene that would show these observations.
Question 412
6 marks · Normal
Answer and see the solution →Hex-2-ene, C6H12, is a liquid alkene. A sample is tested and burned under different conditions.
(a)[1 mark]State what is meant by an 'addition reaction' in the context of alkenes.
(b)[2 marks]Write a balanced chemical equation for the complete combustion of hex-2-ene, C6H12.
(c)[1 mark]Draw the structural formula of the compound formed when hex-2-ene reacts with bromine.
(d)[2 marks]Describe how you would test a sample of hex-2-ene using bromine water, and state the expected observation.
Question 413
7 marks · Hard
Answer and see the solution →This question is about alkenes and their addition reactions.
(a)[2 marks]Explain what is meant by an 'unsaturated hydrocarbon'. Refer to the bonding in your answer.
(b)[2 marks]Ethene reacts with hydrogen gas in the presence of a catalyst. Write a balanced chemical equation for this reaction using molecular formulae.
(c)[3 marks]Hydration is another important addition reaction of ethene. State the name and molecular formula of the organic product formed when ethene reacts with steam. Write a balanced chemical equation for this reaction.
Question 414
7 marks · Hard
Answer and see the solution →This question is about isomerism in alkenes and addition reactions.
(a)[2 marks]Butene (C4H8) has several isomers. Draw and name two different structural isomers of butene (use displayed formulae).
(b)[2 marks]But-1-ene reacts with hydrogen in an addition reaction. Write a balanced chemical equation for this reaction using molecular formulae.
(c)[3 marks]State the name and structural formula of the organic compound formed when but-2-ene reacts with steam.
Question 415
7 marks · Hard
Answer and see the solution →This question is about drawing and naming alkenes and their reactions.
(a)[2 marks]Draw the displayed formula of propene (C3H6). Name the type of bond responsible for its unsaturation.
(b)[2 marks]State the product and write the balanced chemical equation for the reaction between propene and hydrogen gas.
(c)[3 marks]Name the organic product and give its molecular formula when propene reacts with steam in the presence of a catalyst.
Question 416
1 mark · Easy
Answer and see the solution →State the number of carbon atoms in a molecule of ethanol.
Question 417
3 marks · Easy
Answer and see the solution →(a)[1 mark]Draw the displayed formula of methanol.
(b)[1 mark]Give the molecular formula for methanol.
(c)[1 mark]State the functional group present in methanol.
Question 418
2 marks · Easy
Answer and see the solution →The displayed formula of an alcohol shows four carbon atoms in a straight chain, with the –OH group attached to the terminal (end) carbon.
Calculate the total number of hydrogen atoms in one molecule of this alcohol. Give your answer using IUPAC naming if possible.
Question 419
2 marks · Easy
Answer and see the solution →Explain why butan-1-ol and propan-1-ol are both classified as alcohols, even though they have a different number of carbon atoms.
Question 420
3 marks · Easy
Answer and see the solution →Table 1. Formulae for some alcohols Name Molecular formula methanol CH4O ethanol C2H6O propan-1-ol C3H8O butan-1-ol C4H10O (a)[1 mark]Name the alcohol with the molecular formula C3H8O.
(b)[1 mark]What pattern do you notice in the number of hydrogen atoms as the number of carbon atoms increases by one?
(c)[1 mark]Predict the molecular formula for the next alcohol in the series after butan-1-ol.