KOT122 Organic Chemistry Assignment 1: Resonance Hybrid, NaH Products, Acidity Ranking and Sunscreen Solubility (20 Marks)
KOT122 Organic Chemistry Tutorial: Assignment 1 Questions (20 Marks)
| Course | KOT122 Organic Chemistry |
| Task | Tutorial Assignment 1 (20 marks) and exercise questions |
| Chapters | 1 to 3 (structure and bonding, acids and bases, functional groups) |
| Textbook | Janice Gorzynski Smith, Organic Chemistry, 7th edition |
KOT122 Assignment 1 asks first-year chemistry students in Malaysia to apply early organic chemistry concepts: resonance in a cation, acid-base reactions with sodium hydride, relative acidity and conjugate base strength, and how polarity decides whether a sunscreen washes off in water.
Assignment 1 Questions (20 Marks)
The structures for each question are given as diagrams in the original brief.
- Draw all resonance structures for the given cation and its resonance hybrid. (6 marks)
- Predict the product when each of three given compounds (a, b and c) is treated with NaH. (6 marks)
- For the given set of compounds: (i) rank them in order of increasing acidity; (ii) predict which compound forms the strongest conjugate base. (5 marks)
- Avobenzone and dioxybenzone are two commercial sunscreens. (i) Predict which sunscreen is more readily washed off when a person goes swimming. (ii) Explain your choice. (3 marks)
Exercise Questions
From Organic Chemistry (7th edition) by Janice Gorzynski Smith (McGraw-Hill):
- Chapter 1: 51, 56, 57 (d, e), 77
- Chapter 2: 48 (a, b), 49 (c, d), 59, 62
- Chapter 3: 40, 45, 54, 62
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Most marks in KOT122 Assignment 1 come from showing reasoning, not just final answers. Use correct curved arrows for each resonance form and then draw the hybrid, treat NaH as a strong non-nucleophilic base that deprotonates the most acidic hydrogen, and justify your acidity ranking with conjugate base stability (electronegativity, resonance, induction and hybridisation). For the sunscreens, compare their polar groups and hydrogen-bonding ability to decide which dissolves more readily in water. Our chemistry homework helper team can check your structures and explanations, you can ask our assignment review service to check the draft before you submit, and you can explore worked science and engineering assignment samples.
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