RI Arenes Remedial

Name: ………………………………………. ( ) Class: ……………. Date: ……………. Raffles Institution Year 6 H2 Chemistry 2025 Set A T1W8 – Arenes Notes: ⎯ Pre-ChemFocus Activity ⎯ • Familiarise yourself with the following mechanism: Electrophilic substitution of arenes • To view infopack at IVY > C2025 – H2 CHEMISTRY > Pages > [ChemFocus] T1W8 Arenes > FIRST VIDEO ONLY • • • •

Self-Check Questions 1 Suggest the major organic product(s) formed from the following reactions. (Refer to the Data Booklet for directing effects) (a) (b) (c) (d) (e) Check your answers at IVY > C2025 – H2 CHEMISTRY > Pages > [ChemFocus] T1W8 Arenes > Remaining videos

2 The nitration of benzene requires concentrated nitric acid and concentrated sulfuric acid, heated to 55 °C. Explain whether the nitration of chlorobenzene requires a temperature greater than, equal to, or less than 55 °C. ……………………………………………………………………………………………….…….. …………………………………………………………………………………….……………..[1] 3 Methylbenzene undergoes nitration to form a mixture of 1-methyl-2-nitrobenzene and 1-methyl-4-nitrobenzene. (a) A description of the reaction mechanism producing 1-methyl-4-nitrobenzene is illustrated below. Correct the mechanism by annotating on the figure below. (b) Explain why 1-methyl-4-nitrobenzene was produced in greater amount compared to 1-methyl-2-nitrobenzene. ………………………………………………………………………………………………. …………………………………………………………………………………….………[1]

Tutorial Discussion Questions (to complete before Chemfocus session) 1a State the reagents and conditions needed in each of the following schemes. Draw the structure of the intermediate organic compound in each case. (Hint: consider the directing effects of the group(s) already bonded to the benzene ring.) (i) Reagents and conditions Step 1: …………………………………………………………………………………… Step 2: …………………………………………………………………………………… (ii) Reagents and conditions Step 1: …………………………………………………………………………………… Step 2: …………………………………………………………………………………… (iii) Reagents and conditions Step 1: …………………………………………………………………………………… Step 2: …………………………………………………………………………………… Step 1 Step 2 Br NO2

2a (i) Draw the mechanism of the reaction to form compound A from benzene, showing any intermediates, and movement of electron pairs by using curly arrows. A [2] (ii) Draw the major product formed when compound A reacts with BrCl in the presence of a Lewis acid catalyst. Explain your answer Major product: ……………………………………………………………………………………………….. ……………………………………………………………………………………………..[2] CH3O

Tutorial Practice Questions (to be attempted IN CLASS) 1b [RI 2001 Promos/C3] Compound A has a mol