ACSBR 20C Alkanes Alkenes - Assignment

Anglo-Chinese School (Barker Road) A Methodist Institution Founded in 1886 CHEMISTRY DEPARTMENT OF SCIENCE Name: ( ) Class: SEC 4 OC: ALKANES & ALKENES – ASSIGNMENT ALEX LEE/2010 PAGE 1 OF 6 PURE/COMBINED/N-LEVEL Multiple-Choice Questions [20 Marks] TOTAL SCORE / 30 Write in your selected answer for the multiple-choice questions in the boxes provided. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1. Which of the following compounds is unsaturated? A C B D 2. Which of the following best describes alkanes? A All molecules which are saturated hydrocarbons are alkanes. B All molecules which consist only of single bonds are alkanes. C All molecules which contain C–C bonds are alkanes. D All molecules which react with gaseous chlorine are alkanes. 3. Which of the following correctly describes saturated compounds? A All saturated compounds are hydrocarbons. B All saturated compounds are solid at room temperature. C All saturated compounds are unable to undergo addition reactions. D All saturated compounds only contain single bonds. 4. Which of the following compounds is able to undergo an addition reaction with chlorine? A C3H5COOH B C4H8Cl2 C C4H9OH D C5H12 C C O H H H O H C C O H H H H H H C C C H Cl H H H H H H H C C C H H H H H

ALEX LEE/2010 PAGE 2 OF 6 5. Gaseous samples of ethane and ethene can most easily be differentiated by A bubbling through aqueous bromine. B comparing their combustion products. C measuring their molar volume. D reacting with chlorine under ultra-violet light. 6. Which of the following equations does not represent an addition reaction? A C2H4 + Br2 ⎯→ C2H4Br2 B C3H6 + H2O ⎯→ C3H7OH C C4H7Cl + H2 ⎯→ C2H9Cl D CH2Br2 + Br2 ⎯→ CHBr3 + HBr 7. In the combustion of an alkane, which of the following may not be produced? A carbon monoxide C soot (carbon) B hydrogen D water vapour 8. During incomplete combustion, a yellow flame is formed due to the soot produced. Which of the following is unable to produce a yellow flame upon combustion? A carbon monoxide C propene B charcoal D propanoic acid 9. An alkane X undergoes catalytic cracking. Which of the following statements is false? A Carbon dioxide gas may be formed. B Hydrogen gas may be formed. C One of the products must be an alkane. D One of the products must be an alkene. 10. An experiment is set up as shown. What is the name of the reaction that takes place? A combustion B cracking C distillation D substitution heat gaseous hydrocarbons mineral wool soaked in paraffin broken porous pot water

ALEX LEE/2010 PAGE 3 OF 6 11. Three isomers are shown below. molecule A molecule B molecule C Which of the molecules may have been the product(s) of an addition reaction with gaseous chloride and the product(s) of a substitution reaction with gaseous chlorine respectively? product of addition of chlorine product of substitution with chlorine A A, B and C A and B only B B and C only A only C B only A, B and C D B only A and C only 12. When ethane undergoes a s u b s t i t u t i o n r e a c t i o n w i t h c h l o r i n e , w h i c h o f t h e f o l l o w i n g compounds may be produced? (i) dichloroethane (ii) hydrogen chloride (iii) hydrogen gas (iv) trichloroethane A (i) and (iii) only B (i) and (iv) only C (i), (ii) and (iv) only D (ii) and (iii) only 13. The conversion of ethene to ethane may not be described as A addition. B hydrogenation. C reduction. D substitution. 14. Propane gas c r a c k e d t o p r o d u c e h y d r o g e n a n d organic p r o d u c t Y. Y reacts with steam, under special conditions, to form Z. Which of the following could be the structure of Z? A C B D C C C H H H H H H H H C C O O H H H H H H C C C H H H H H H O H H C C C H Cl H H Cl H H H C C C Cl H H Cl H H H H C C C H H H H H Cl H Cl C C O H H H H H H

ALEX LEE/2010 PAGE 4 OF 6 15. The vapour of an alcohol (Mr = 6 0 ) w a s b u b b l e d t h r o u g h c o n c e n t r a t e d s u l f u r i c a c i d . A gaseous hydrocarbon X was produced which decolourised bromine water. Which one of the following is the molecular formula of X? A C2H4 B C2H6 C C3H6 D C3H8 16. In the manufacture of margarine, hydrogen is added to A an alkane. B animal fat. C crude oil. D vegetable oil. 17. Ethene can be converted into ethanol. Which of the following correctly gives the name and the conditions for this reaction? name of reaction temperature pressure catalyst A addition of hydrogen 200 °C 60 atm finely divided iron B addition of hydrogen 300 °C 1 atm nickel metal C addition of steam 200 °C 1 atm silicon dioxide D addition of steam 300 °C 60 atm phosphoric(V) acid 18. Butan-2-ol, as shown below, is produced by the reaction of steam to an alkene. From which of the following alkenes can the above alcohol be manufactured from? (i) (ii) A (i) only B (ii) only C both (i) and (ii) D neither (i) or (ii) 19. A carboxylic acid undergoes the following reaction: + Br2 ⎯→ + HBr What is the type of reaction that has occurred? A addition B combustion C cracking D substitution C C C H O H Br H O H H C C C H O H H H O H H C C C H C H H H H H H H C C C H H H H H H O H H C H H C C C H C H H H H H H H

ALEX LEE/2010 PAGE 5 OF 6 20. A molecule of chlorobutene undergoes an addition reaction with hydrogen chloride (HCl), as shown below. Which of the following shows a possible structure of molecule X? A C B D Structured Questions [10 Marks] 21. An unsaturated hydrocarbon, X, undergoes an addition reaction with aqueous bromine. The structure of hydrocarbon X can be represented in the diagram below. (a) Define the term ‘unsaturated hydrocarbon’. [2] (b) Define the term ‘addition’. [2] (c) (i) Describe the observations that would be made when X reacts with bromine. [1] C C H H H C H H C C C C H Cl H H H H H H H Cl + ⎯⎯→ molecule X C C C C H Cl Cl H H H H H C C C C H Cl H H H H H H Cl H C C C C H H H Cl H H H H C C C C H Cl H H H H H Cl H H

ALEX LEE/2010 PAGE 6 OF 6 (ii) Draw the structure of the product formed between X and bromine. [1] 22. Observe the reaction diagram below. Reaction I Reaction II Reaction III ⎯⎯⎯⎯→ ⎯⎯⎯⎯→ ⎯⎯⎯⎯→ C8H18 C3H6 C3H8 C3H6Cl2 (a) What is the name given to Reaction I? [1] (b) State the conditions necessary for Reaction II. [1] (c) Write down the name, the conditions and the equation for Reaction III. [2] Name: Conditions: Equation: END