Chemistry · Oct / Nov 2025 · Paper 42 · Question 5
0620
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This question is about the homologous series of alkanes. Three general characteristics of alkanes are: • they are generally unreactive because they do not have a functional group • they show trends in their physical properties, such as melting points and boiling points • they have similar chemical properties.
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5(a)[2]
M1 (have a) general formula of CnH2n+2
M2 differ from one member to the next by a –CH2– unit
5(b)(i)[1]
increases
5(b)(ii)[2]
M1 physical property
M2 change as chain length increases
5(c)[1]
all carbon–carbon bonds are single (bonds)
5(d)(i)[1]
ultraviolet light
5(d)(ii)[4]
M1 CH3CH2CH2Cl
M3 1-chloropropane
M2 CH3CHClCH3
M4 2-chloropropane
5(d)(iii)[1]
(compounds with) the same molecular formula but different structural formulae or structure
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