Which equation represents a valid propagation step in the free radical reaction between ethane and chlorine?
C2H6 + Cl• C2H5Cl + H•
C2H5Cl + Cl• C2H4Cl• + HCl
C2H6 + H• C2H5• + HCl
C2H5• + Cl• C2H5Cl
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Syllabus Edition
First teaching 2023
First exams 2025
Which equation represents a valid propagation step in the free radical reaction between ethane and chlorine?
C2H6 + Cl• C2H5Cl + H•
C2H5Cl + Cl• C2H4Cl• + HCl
C2H6 + H• C2H5• + HCl
C2H5• + Cl• C2H5Cl
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One of the reactions taking place in a catalytic converter in a car exhaust system is between nitrogen oxide and octane (unburned petrol). The products of this reaction are non-toxic.
Which is the correct equation for the reaction?
C8H16 + 16NO 8CO + 8N2 + 8H2O
C8H16 + 24NO 8CO2 + 12N2 + 8H2O
C8H18 + 17NO 8CO + 8 N2 + 9H2O
C8H18 + 25NO 8CO2 + 12 N2 + 9H2O
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The hydrocarbon C17H36 can be cracked.
Which compound is the least likely to be produced in this reaction?
C3H8
C4H8
C8H16
C16H34
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In the presence of ultraviolet light, ethane and chlorine react to give a mixture of products.
Which compound could be present in the mixture of products?
CH3Cl
CH3CH2CH2Cl
CH3CH2CH2CH3
CH3CH2CH2CH2CH3
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The cracking of a single hydrocarbon molecule, CnH2n+2, produces two hydrocarbon molecules only. Each hydrocarbon product contains the same number of carbon atoms in one molecule. Each hydrocarbon product has non-cyclic structural isomers.
What is the value of n?
9
8
6
4
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Which hydrocarbon would not be collected in the inverted tube by heating pentane,
CH3(CH2)3CH3, in the apparatus shown?
CH4
CH3CH3
CH3CH2CH=CH2
CH3(CH2)8CH3
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0.200 mol of a hydrocarbon undergoes complete combustion to give 35.2 g of carbon dioxide and 14.4 g of water as the only products.
What is the molecular formula of the hydrocarbon?
C2H4
C2H6
C4H4
C4H8
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Samples of 10 cm3 of each of the first four members of the alkane series are separately mixed with 70 cm3 of oxygen. Each is then burned and the total volume, V, of residual gas measured again at room temperature and pressure.
Which graph represents the results that would be obtained?
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The petrol additive tetraethyl-lead (IV), Pb(C2H5)4, is now banned in many countries. When it is completely burned in air, lead (II) oxide, CO2 and H2O are formed.
How many moles of oxygen are required to burn one mole of Pb(C2H5)4?
9.5
11
13.5
27
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The cracking of eicosane, C20H42, produces a hydrocarbon that is in very high demand for transportation and also three consecutive members of the same homologous series of hydrocarbons.
What are the correct products of cracking for the given reaction?
Butene, octane, pentene, propene
Butane, butene, hexene, octane
Ethane, hexene, heptene, pentene
Ethene, hexane, heptene, pentene
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