2024 Prelims EJC H2 Chem P3 (Ans)

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2024 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 3 – INDEX NUMBER CHEMISTRY Paper 3 Free Response 9729/03 12 September 2024 2 hours Candidates answer on the Question Paper Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, civics group, index number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. If addition space is required, you should use the pages at the end of this booklet. The question number must be clearly shown. Section A Answer all the questions Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Paper 3 Section A 1 / 20 2 / 20 3 / 20 Section B 4 / 20 5 / 20 Total / 80 This document consists of 31 printed pages and 1 blank page.

2 © EJC 9729/03/J2PE/24 BLANK PAGE

3 © EJC 9729/03/J2PE/24 [Turn Over Section A Answer all the questions in this section. 1 Alkenylbenzene molecules are secondary plant metabolites with certain levels of toxicity, despite their presence in herbs and spices . One type of alkenylbenzene is (2-ethylethenyl)benzene. (a) (2-ethylethenyl)benzene exhibits stereoisomerism and exists as a pair of stereoisomers L and M. The structure of M is as shown. (i) State the type of stereoisomerism exhibited by (2-ethylethenyl)benzene. [1] (ii) Draw the skeletal structure of L. [1] (iii) Draw the structure of a constitutional isomer of M that fulfils the following criteria: • does not exhibit the stereoisomerism stated in (a)(i) • has a non-terminal alkene [1] ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ..