ST. JOSEPH’S INTERNATIONAL SCHOOL IGCSE CHEMISTRY QUIZ 1: ORGANIC CHEMISTRY (PART 1) NAME: __________________________________ CLASS: _____________ DATE: _____________ Section A: Multiple choice questions (14 marks) . 1 Which formula is that of an alkene? A C2H6 B C3H6 2 The structures of four organic compounds are shown. C D C3H8 Which statement is not correct? 3 4 5 A Only one of the compounds is an alcohol. B Only one of the compounds is an alkane. C Only one of the compounds is unsaturated. D Only three of the compounds are hydrocarbons. Which equation represents incomplete combustion of ethane? A C2H6 + O2 → 2CO + 3H2 B C2H6 + 2O2 → 2CO2 + 3H2 C 2C2H6 + 5O2 → 4CO + 6H2O D 2C2H6 + 7O2 → 4CO2 + 6H2O Which statement about alkane molecules is correct? A They contain carbon, hydrogen and oxygen atoms. B They contain double bonds. C They contain ionic bonds. D They burn in oxygen. Which substance is methane? volatility electrical conductivity at room temperature solubility in water A high good soluble B high poor insoluble C low good soluble D low poor insoluble SJIS 2020 1 C4H10 6 7 Which statement about alkanes is correct? A They contain carbon-carbon double bonds. B They form carbon dioxide and water on combustion. C They are converted to alcohols by reaction with steam. D Ethane has one more carbon atom and one more hydrogen atom than methane. The table shows the homologous series of the alkane. name of compound formula methane CH4 ethane C2H6 propane ? butane C4H10 pentane C5H12 What is the formula of propane? A 8 10 C C3H7 C3H8 D C3H9 D 2, 3 and 4 Which of the compounds shown are in the same homologous series? A 9 B C2H8 1, 2 and 3 1 CH3OH 2 CH3CH2OH 3 CH3COOH 4 CH3CH2CH2OH B 1, 2 and 4 C 1, 3 and 4 Which compound is not an alkane, CnH2n+2? A CH3CH2CH2CH3 B (CH3)2CHCH3 C CH3CHCHCH3 D (CH3)3CH Which homologous series is not represented in the compounds shown below? A alcohols B alkanes C alkenes D carboxylic acids SJIS 2020 2 11 Ethene, propene and butene are all members of the same homologous series Which statement explains why ethene, propene and butene have similar chemical properties? 12 A They all have the same functional group. B They are all gases at room temperature. C They are all hydrocarbons. D They are all organic. The structure of four molecules are shown. Which molecules belong to the same homologous series? A 13 1 and 2 B C 1 and 3 2 and 4 D 3 and 4 D O―H The diagram shows the structures of three compounds. Why do these three compounds belong to the same homologous series? 14 A They all contain carbon, hydrogen and oxygen. B They all have the same functional group. C They are all carbon based molecules. D They are all flammable liquids. Which bond is not in a molecule of ethanoic acid? A C―O B C=O C SJIS 2020 3 C=C Section B: Short answer questions (42 marks) 1 The table shows the displayed formulae of some organic compounds. SJIS 2020 4 [Total: 12] 2 The table shows the displayed formulae of six organic compounds, P, Q, R, S, T and U. SJIS 2020 5 (ii) State the general formula of this homologous series. (1) ….………………………………………………………………………………………………………………….. (c) Complete the table to show the displayed formula and name of the isomer of compound T. (1) (d) The equation represents a reaction between compound P and bromine. ….………………………………………………………………………………………………………………….. SJIS 2020 6 (f) [Total: 13] 3 Alkanes are saturated hydrocarbons that can be obtained from crude oil. SJIS 2020 7 ….………………………………………………………………………………………………………………….. [Total: 7] 4 A teacher explained the different types of formula used in organic chemistry, using ethene as an example. SJIS 2020 8 (a) Use this example to help you write the formulae described below. (i) The empirical formula of methane. (ii) The molecular formula of ethane. (iii) The structural formula of propanol. (iv) The displayed formula of butanoic acid. (1) (1) (1) (1) (b) All the compounds in part (a) can undergo a complete combustion when burned in oxygen to form carbon dioxide and water. (i) Write a chemical equation for the complete combustion of propanol (C3H7OH). (ii) Identify one solid product and one gaseous product that could form during the incomplete combustion of propanol. (2) (2) solid product gaseous product (c) The displayed formula of pentane is Draw a displayed formula for the other two isomers of pentane. isomer 1 (2) isomer 2 [Total: 10] SJIS 2020 9 SJIS 2020 10