Fig. 4.1 shows a possible synthesis of propene, C₃H₆. [Figure 4.1]

1. (a)(i)Identify the type of reaction that occurs in reaction 1.[1]
2. (a)(ii)Suggest a suitable reagent for reaction 2.[1]
3. (a)(iii)Reaction 3 is an elimination reaction. Write an equation for this reaction and identify the solvent and conditions used. equation .......... solvent and conditions ..........[2]
4. (a)(iv)C₂H₅CH₂OH can be directly converted to C₃H₆. Suggest the reagent and conditions for this conversion.[1]
5. (b)Under suitable conditions, propene polymerises to form poly(propene). Poly(propene) exhibits stereoisomerism.
6. (b)(i)Identify the type of polymerisation that forms poly(propene) from propene.[1]
7. (b)(ii)Define stereoisomerism.[2]
8. (b)(iii)Draw a section of poly(propene), showing two repeat units. Use your diagram to identify the type of stereoisomerism shown by poly(propene). Explain your answer.[3]
9. (b)(iv)State two difficulties associated with the disposal of poly(propene). 1 .......... 2 ..........[2]
10. (c)Under different conditions, two molecules of propene can combine to form compounds X and Y. [Structures of X and Y]
11. (c)(i)Name X.[1]
12. (c)(ii)Fig. 4.2 shows the mass spectrum of either compound X or compound Y. [Figure 4.2] Identify which of X and Y gives this mass spectrum. Give one reason for your answer, referring to the fragmentation pattern.[1]
13. (c)(iii)The molecular ion peak in the spectrum in Fig. 4.2 has relative abundance 34.7. Calculate the relative abundance of the [M+1]⁺ peak in this spectrum. relative abundance of [M+1]⁺ peak = ..........[1]

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