11.2. Naming organic compounds
A subsection of Chemistry, 0620, through 11. Organic chemistry
Listing 10 of 185 questions
Ethanol is manufactured by two different processes. For each process, name the organic reactant and state the type of reaction. organic reactant type of reaction organic reactant type of reaction  Alcohols can be oxidised to form carboxylic acids. Name a suitable oxidising agent for this reaction. Alcohols can be partially oxidised to form aldehydes. Aldehydes are a homologous series of organic compounds. Partial oxidation is achieved by reacting an alcohol with the oxidising agent in distillation apparatus as shown. heat thermometer distillate A round-bottomed flask Name apparatus A. On the diagram, use one arrow to show where water enters apparatusA. The table shows some information about aldehydes. Complete the table. name ethanal propanal butanal molecular formula CH2O C2H4O C3H6O  Deduce the general formula of aldehydes. The structural formula of ethanal is shown. C H C O H H H The C=O group in aldehydes is at the end of the carbon chain. This is a reactive part of the molecule. What is the name given to the reactive part of any organic molecule? Complete the dot-and-cross diagram to show the electron arrangement of a molecule of ethanal. Inner shells have been drawn. C C O H H H H  Propanone belongs to a homologous series called ketones. Ketones have the same C=O group as aldehydes but the C=O group is not at the end of the carbon chain. Propanone has the same molecular formula as propanal, C3H6O. What term is used to describe molecules with different structures but with the same molecular formula? Suggest the structure of propanone, C3H6O. Show all of the atoms and all of the bonds.  
0620_s20_qp_41
THEORY
2020
Paper 4, Variant 1
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The structures of five organic compounds, A, B, C, D and E, are shown. Answer the questions that follow. Each letter may be used once, more than once or not at all. H C H H C A H H C C O O H H C C C C H H H H H H H C H H C B H H C H H H H H C H H C C O O H H H C H H C D E H H C O H H H H Give the letter of the compound that is propan-1-ol. Give the letter of the compound that has the empirical formula CH2. Give the letter of one compound that reacts with bromine in an addition reaction. Give the letter of one compound that reacts with chlorine to form the compound shown. H C H H C Cl H C H H H Give the letters of two compounds that can react with each other to form an ester. and �������������������������������������������������������������� Give the letter of the compound that is in the same homologous series as hex‑1‑ene. Give the letter of one compound that is an acid. Draw a structural isomer of compoundD. Show all of the atoms and all of the bonds.  Some acids are described as weak acids. State the meaning of the term weak acid. weak acid  
0620_s20_qp_43
THEORY
2020
Paper 4, Variant 3
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Many organic compounds contain carbon, hydrogen and oxygen only. An organic compound V has the following composition by mass. C, 48.65%; H, 8.11%; O, 43.24% Calculate the empirical formula of compound V.  empirical formula = CompoundW has the empirical formula CH4O and a relative molecular mass of 32. Calculate the molecular formula of compoundW.  molecular formula = Compounds X and Y have the same general formula. X and Y are both carboxylic acids. CompoundX has the molecular formula C2H4O2. CompoundY has the molecular formula C4H8O2. Deduce the general formula of compounds X and Y. Draw the structure of compoundY. Show all of the atoms and all of the bonds. Name compoundY. name  Give the name used to describe a ‘family’ of similar compounds with the same general formula, similar chemical properties and the same functional group. Propene is an unsaturated hydrocarbon. The formula of propene is shown. CH3CH=CH2 State the colour change observed when propene is added to aqueous bromine. from to Propene can be produced by cracking long chain alkanes. Pentadecane, C15H32, is cracked to produce an alkane and propene in a 1 : 2 molar ratio. Complete the chemical equation for this reaction. C15H32 → +  Propene can be converted into poly. Name the type of polymerisation that occurs when propene is converted into poly. Complete the diagram to show a section of poly. C C C C  
0620_s21_qp_41
THEORY
2021
Paper 4, Variant 1
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