JPJC 2026 Alkene Assignment

2026 JPJC J1 H2 Chemistry (9476) 1 [Turn Over JURONG PIONEER JUNIOR COLLEGE 2026 JC1 H2 Chemistry (9476) Topical Assignment Topic 10: Alkenes Name : __________________________________________ 10 Class : 26S ___ Date : ____________ Duration : 15 minutes 1 Cyclohexene, C6H10, is one of the important precursors to produce hexanedioic acid, which is widely used to manufacture nylon. Some reactions of cyclohexene are shown in Figure 1. Fig. 1 (a) (i) State the reagents and conditions for reactions 1 to 4. reaction 1: ……………………………………………………………………………… reaction 2: ……………………………………………………………………………… reaction 3: ……………………………………………………………………………… reaction 4: ……………………………………………………………………………… [4] OH reaction 4

2026 JPJC J1 H2 Chemistry (9476) 2 ` (ii) Draw the displayed formula for compound B. [1] (b) But-1-ene is also a common monomer that is used to produce polyalkenes. (i) Predict the major product, P, when but-1-ene is reacted with HBr(g) in the dark. State and draw the mechanism for this reaction for the formation of P. Show any relevant lone pairs, dipoles and charges, and indicate the movement of electron pairs with curly arrows. Major product, P: Mechanism: ………………………………….. [3] (ii) Suggest a simple laboratory test to distinguish between cyclohexene and but-1-ene. State your observations for the test. Test: ……………………………………………………………………………………... ……………………………………………………………………………………………. Observations: …………………………………………………………………………… ……………………………………………………………………………………………. …………………………………………………………………………………………….. [2] [Total: 10]

2026 JPJC J1 H2 Chemistry (9476) 3 [Turn Over