Chemistry_Grade_10-12 (1).pdf

Exercise summary exercise 1 give one word for each of

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Exercise: Summary exercise 1. Give one word for each of the following descriptions: (a) The group of hydrocarbons to which 2-methyl-propene belongs. (b) The name of the functional group that gives alcohols their properties. (c) The group of organic compounds that have acidic properties. (d) The name of the organic compound that is found in vinegar. (e) The name of the organic compound that is found in alcoholic beverages. 180
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CHAPTER 9. ORGANIC MOLECULES - GRADE 12 9.12 2. In each of the following questions, choose the one correct answer from the list provided. (a) When 1-propanol is oxidised by acidified potassium permanganate, the possible product formed is... i. propane ii. propanoic acid iii. methyl propanol iv. propyl methanoate (IEB 2004) (b) What is the IUPAC name for the compound represented by the following structural formula? H C Cl H C Cl Cl C H C H H H H i. 1,2,2-trichlorobutane ii. 1-chloro-2,2-dichlorobutane iii. 1,2,2-trichloro-3-methylpropane iv. 1-chloro-2,2-dichloro-3-methylpropane (IEB 2003) 3. Write balanced equations for the following reactions: (a) Ethene reacts with bromine (b) Ethyne gas burns in an excess of oxygen (c) Ethanoic acid ionises in water 4. The table below gives the boiling point of ten organic compounds. Compound Formula Boiling Point ( 0 C) 1 methane CH 4 -164 2 ethane C 2 H 6 -88 3 propane C 3 H 8 -42 4 butane C 4 H 10 0 5 pentane C 5 H 12 36 6 methanol CH 3 OH 65 7 ethanol C 2 H 5 OH 78 8 propan-1-ol C 3 H 7 OH 98 9 propan-1,2-diol CH 3 CHOHCH 2 OH 189 10 propan-1,2,3-triol CH 2 OHCHOHCH 2 OH 290 The following questions refer to the compounds shown in the above table. (a) To which homologous series do the following compounds belong? i. Compounds 1,2 and 3 ii. Compounds 6,7 and 8 (b) Which of the above compounds are gases at room temperature? (c) What causes the trend of increasing boiling points of compounds 1 to 5? (d) Despite the fact that the length of the carbon chain in compounds 8,9 and 10 is the same, the boiling point of propan-1,2,3-triol is much higher than the boiling point of propan-1-ol. What is responsible for this large difference in boiling point? (e) Give the IUPAC name and the structural formula of an isomer of butane. 181
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9.12 CHAPTER 9. ORGANIC MOLECULES - GRADE 12 (f) Which one of the above substances is used as a reactant in the preparation of the ester ethylmethanoate? (g) Using structural formulae, write an equation for the reaction which pro- duces ethylmethanoate. ( IEB 2004 ) 5. Refer to the numbered diagrams below and then answer the questions that follow. HO C C C C H O H H H H H H 1 HO C C H H H H H 2 H C C C C H H Br H Br 3 H C C O C H H O H H 4 H (a) Which one of the above compounds is produced from the fermentation of starches and sugars in plant matter? i. compound 1 ii. compound 2 iii. compound 3 iv. compound 4 (b) To which one of the following homologous series does compound 1 belong?
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