W is a colourless liquid. [Fig. 5.1]

1. (a)(i)Deduce the empirical formula of W.[1]
2. (a)(ii)Two different reagents are each added to separate samples of W as shown in Table 5.1. Complete Table 5.1.[4]
3. (b)(i)Deduce the number of sigma (ơ) bonds and pi (π) bonds present in Z. number of σ bonds ................................................... number of π bonds ...................................................[2]
4. (b)(ii)W reacts with LiAlH₄ to produce Y. Draw the structure of Y.[1]
5. (b)(iii)Identify the role of LiAlH₄ when it reacts with W.[1]
6. (b)(iv)Suggest the reagent and conditions required when W is converted into Z.[1]
7. (b)(v)Fig. 5.3 shows the structure of Z. Fig. 5.4 is the infrared spectrum of Z. Identify the bond and functional group responsible for each of the absorptions labelled A, B, C and D in Fig. 5.4. A ................................................... B ................................................... C ................................................... D ...................................................[2]
8. (b)(vi)Z is used to produce addition polymer Q. Draw the repeat unit of polymer Q.[1]
9. (c)Poly(ethene) is an addition polymer made from ethene. Explain why ethene reacts with electrophiles but poly(ethene) does not.[1]

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