KOT122 Organic Chemistry Tutorial Assignment 1: Resonance Structures, NaH Reactions, Acidity and Sunscreen Polarity

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Tutorial Assignment 1 (20 marks)

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KOT122 Organic Chemistry

Uploaded by Malaysia Assignment Help

Date

10/23/2026

KOT122 Organic Chemistry: Tutorial Assignment 1 (20 Marks)

Course	KOT122 Organic Chemistry
Assessment	Tutorial Assignment 1 plus textbook exercise questions
Marks	20
Topics	Resonance, acid-base reactions with NaH, acidity and conjugate bases, polarity and solubility
Textbook	Organic Chemistry, 7th edition, Janice Gorzynski Smith (McGraw-Hill)

This KOT122 tutorial assignment covers the first three chapters of an introductory university organic chemistry course in Malaysia: drawing resonance structures, predicting acid-base products with sodium hydride, ranking acidity, and applying polarity to two real sunscreen molecules.

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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KOT122 Assignment 1 checks the chapter 1 to 3 basics: curved-arrow resonance, acid-base reactions and acidity trends. For the resonance question, move only electrons and show the hybrid with partial charges; for NaH, remember the hydride acts as a strong base and removes the most acidic proton. Rank acidity by stabilising the conjugate base (electronegativity, resonance, inductive effects and hybridisation), and answer the sunscreen question by comparing polarity and hydrogen bonding in avobenzone and dioxybenzone. Our science and engineering assignment help can check your mechanisms, and you can see related briefs such as the SK12703 organic chemistry assignment or the sodium hydride and methoxide question.

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