Section A box Answer all questions in this section. 0 1 This question is about the analysis of organic compounds. 0 1 . 1 Table 1 shows the results of chemical tests on three organic compounds. Complete the empty boxes in the table. Table 1 Chemical test Add bromine water orange to colourless no visible change no visible change bubbles of gas no visible change Warm with Fehling’s solution no visible change no visible change [3 marks] 3 *03* Turn over ► IB/M/Jun24/7404/2 Do not write outside the box 0 1 . 2 0.500 g of a hydrocarbon is analysed. The hydrocarbon contains 0.450 g of carbon. Calculate the empirical formula of this hydrocarbon. [3 marks] Empirical formula Turn over for the next question 6 4 *04* IB/M/Jun24/7404/2 Do not write outside the box 0 2 This question is about infrared spectroscopy. 0 2 . 1 Compounds A and B both have the molecular formula C4H8O2 Figure 1 shows the infrared spectra of compounds A and B. Use the infrared spectra to deduce a possible structural formula for compound A and a possible structural formula for compound B. [2 marks] Figure 1 Possible structural formula of A Possible structural formula of B 5 *05* Turn over ► IB/M/Jun24/7404/2 Do not write outside the box 0 2 . 2 Figure 2 shows the infrared spectrum of either pent-1-ene or 2-methylbut-2-ene. Figure 2 Outline how to use the infrared spectrum to determine whether the compound is pent-1-ene or 2-methylbut-2-ene. [2 marks] Question 2 continues on the next page 6 *06* IB/M/Jun24/7404/2 Do not write outside the box 0 2 . 3 Figure 3 shows the infrared spectrum of methane. Figure 3 Use information from Figure 3 to explain why methane acts as a greenhouse gas. [1 mark] 5 7 *07* Turn over ► IB/M/Jun24/7404/2 Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 8 *08* IB/M/Jun24/7404/2 Do not write outside the box 0 3 This question is about CFCl3 CFCl3 used to be the propellant in most aerosol cans. 0 3 . 1 Use IUPAC rules to name CFCl3 [1 mark] 0 3 . 2 Give an equation for each of the two propagation steps in the conversion of CHFCl2 into CFCl3 [2 marks] Equation 1 Equation 2 0 3 . 3 In the presence of ultraviolet radiation, CFCl3 breaks down in the upper atmosphere to form chlorine free radicals. Give an equation for this reaction