Alkenes. Question Paper 1. Chemistry (0620/0971) Cambridge International Examinations (CIE) Topic. Organic chemistry Sub-Topic. Alkenes.

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1 or more awesome resources, visit us at lkenes Question Paper 1 Level IGSE Subject hemistry (0620/0971) Exam oard ambridge International Examinations (IE) Topic Organic chemistry Sub-Topic lkenes ooklet Question Paper 1 53 minutes Time llowed: Score: /44 Percentage: /100 Grade oundaries: >85% 75% 68% 60% 53% 48% % 33% <25%

2 1 The apparatus shows an experiment used to test gas X. gas X orange bromine solution The bromine solution quickly becomes colourless. What is the structure of gas X? O 2 compound has the formula 3 2 = 2. Which row in the table shows the type of compound and the colour change when aqueous bromine is added? type of compound saturated saturated unsaturated unsaturated colour change brown to colourless colourless to brown brown to colourless colourless to brown 2

3 3 The diagram shows the structure of a compound. O To which classes of compound does this molecule belong? 4 Which structure is incorrect? O O O 5 lkenes have the general formula n 2n. Which of the following is an alkene?

4 6 The structure of a compound is shown. O O Which functional groups are present in this compound? 7 When a long chain hydrocarbon is cracked, the following products are produced Which products would decolourise bromine water? 1 and 4 2 and 3 2 only 3 only 8 utene is an alkene which is manufactured by cracking hydrocarbons. Which hydrocarbon can be cracked to make butene? ethane, 2 6 decane, methane, 4 propane, 3 8 4

5 9 The diagram shows some properties of two organic compounds X and Y. reacts with bromine used as a fuel X steam and a catalyst Y polymerises used as a solvent What are X and Y? X ethane ethane ethene ethene Y ethanoic acid ethanol ethanoic acid ethanol 10 chemist carried out a cracking reaction on a hydrocarbon, X, and obtained two products, Y and Z. X + Y Z The chemist then wrote the following statements in his notebook molecule of X has 7 carbon atoms. Y is unsaturated. Z will decolourise bromine water. Which statements are correct? 3 only 1 and 2 1 and 3 1, 2 and 3 5

6 11 Molecule X is both an alkene and a carboxylic acid. Which row describes X? 12 Which hydrocarbon reacts with steam to produce ethanol? Which molecular structure shows hexene? O O O 14 Which statement about alkenes is not correct? The functional group is =. The structural difference between one member and the next is 3. They form a homologous series. They turn aqueous bromine from brown to colourless. 6

7 15 The diagram shows a reaction sequence. X Y butane ethene ethanol Which row names the processes X, Y and Z? Z carbon dioxide and water X Y Z cracking fermentation respiration cracking hydration combustion distillation fermentation respiration distillation hydration combustion 16 lkenes are manufactured by cracking hydrocarbons obtained from petroleum. alkane X obtained from petroleum cracking alkene Y Which row describes the process of cracking? 17 X, Y and Z are three hydrocarbons. X 2 = 2 Y 3 = 2 Z 3 2 = 2 What do compounds X, Y and Z have in common? They are all alkenes. They are all part of the same homologous series. They all have the same boiling point. 1, 2 and 3 1 and 2 only 1 and 3 only 2 and 3 only 7

8 18 The diagram shows the cracking of substance X. cotton wool soaked in X catalyst Y heat water Which type of organic compound is found in Y, which is not present in X? acid alcohol alkane alkene 19 lkenes are manufactured by cracking hydrocarbons obtained from petroleum. hydrocarbon P obtained from petroleum cracking hydrocarbon Q Which row describes the size of the molecules in hydrocarbons P and Q and the effect of Q on aqueous bromine? 8

9 20 ydrocarbons obtained by fractional distillation of petroleum can be cracked to make useful products. Which substance could not be obtained by cracking propane, M r 44? uring the process of cracking hydrocarbons, an is converted into an The presence of an can be shown by a visible reaction with Which words complete gaps 1, 2, 3 and 4? 22 Which statement about alkenes is not correct? They are hydrocarbons. They are saturated. They contain a = bond. They form polymers. 23 ompound Q decolourises bromine water. ompound Q has two carbon atoms in each molecule. Which statement about compound Q is correct? It contains carbon-hydrogen double bonds. It has six hydrogen atoms per molecule. It has two carbon-carbon double bonds. It is produced by cracking alkanes. 9

10 24 hydrocarbon W burns to form carbon dioxide and water. W decolourises bromine water. What is the name of W and what is its structure? name of W structure of W ethane ethane ethene ethene 25 Which reaction is used as a test for alkenes? lkenes burn in air to give carbon dioxide and water. lkenes decolourise aqueous bromine. lkenes form polymers when heated in the presence of a catalyst. lkenes react with steam to form alcohols. 10

11 26 Liquid W burns completely to give carbon dioxide and water. Liquid W is a compound containing carbon, hydrogen and oxygen. solution of liquid W in water is p 7. What is liquid W? ethanoic acid ethanol gasoline methane 27 The structure of a monomer is shown. l Which polymer can be made from this monomer? l l l l l l l l l l l l l l l l l l 11

12 28 The structures of four organic compounds are shown. S T U V Which compounds are unsaturated? S only T and U U only V only 29 racking is an important process in the petroleum industry. The products of cracking include and an of relative molecular mass than the that was cracked. Which words complete gaps 1, 2, 3 and 4? 30 Which compound rapidly decolourises aqueous bromine? ethane ethanoic acid ethanol ethene 12

13 31 Two reactions are shown. 1 butane ethene 2 ethene ethanol Which terms describe reactions 1 and 2? 1 2 cracking addition cracking combustion distillation addition distillation combustion 32 Ethene is a hydrocarbon. Which row shows the type of bond between the carbon atoms in ethene, and the effect of ethene on aqueous bromine? type of bond single bond single bond double bond double bond effect of ethene on aqueous bromine colour changes from brown to colourless colour changes from colourless to brown colour changes from brown to colourless colour changes from colourless to brown 33 Which process produces alkenes from alkanes? combustion cracking fermentation polymerisation 13

14 34 Poly(ethene) is made from ethene. Ethene is hydrocarbon because it contains a carbon to carbon bond. The general name given to small molecules that undergo polymerisation is Which words complete gaps 1, 2 and 3? an unsaturated double monomers an unsaturated single alkenes a saturated double alkenes a saturated single monomers 35 Which type of hydrocarbon reacts rapidly with aqueous bromine and what is the colour change of the aqueous bromine? type of hydrocarbon alkane alkane alkene alkene colour change of the aqueous bromine brown to colourless colourless to brown brown to colourless colourless to brown 36 Which reaction of ethene is not an addition reaction? reaction with bromine reaction with hydrogen reaction with oxygen reaction with steam 14

15 37 The diagram shows a flow diagram. substance X substance Y petroleum burns with yellow flame does no decolourise bromine water decolourise bromine water undergoe addition polymerisation Which type of organic compounds are X and Y? 38 Which columns describe the hydrocarbons ethane and ethene? state at room temperature reaction with oxygen reaction with aqueous bromine gas gas liquid liquid burns burns burns burns no reaction decolourises bromine no reaction decolourises bromine 1 (ethane) and 2 (ethene) 1 (ethane) and 4 (ethene) 2 (ethene) and 3 (ethane) 3 (ethane) and 4 (ethene) 15

16 39 The structures of four organic compounds are shown. O Which statement is not correct? Only one of the compounds is an alcohol. Only one of the compounds is an alkane. Only one of the compounds is unsaturated. Only three of the compounds are hydrocarbons. 40 hydrocarbon is cracked to make and hydrogen. ompound is formed by the addition polymerisation of. To which homologous series do, and belong? alkene alkane and and and and 16

17 41 The structures of four compounds are shown. W X Y Z Which are members of the same homologous series? W, X, Y and Z W and X only W, Y and Z only X and Z only 42 Ethane and ethene are both hydrocarbons. Ethane reacts with chlorine and ethene reacts with bromine. Which row describes the type of reaction that ethane and ethene undergo? ethane addition addition substitution substitution ethene addition substitution substitution addition 17

18 43 The structures of some organic molecules are shown Which structures represent an alkane with four carbon atoms? 1 only 2 and 3 2 and 4 3 and 4 44 The diagram shows part of the molecule of a polymer. Which diagram shows the monomer from which this polymer could be manufactured? O 18