Isomerism Explained | A Level Chemistry Structural and Stereoisomer Masterclass

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Isomerism Explained | A Level Chemistry Structural and Stereoisomer Masterclass

Description:
Welcome to this A Level Chemistry explanation video on isomerism, perfect for Year 1 organic chemistry. In this masterclass, we explore structural isomers and stereoisomers, including chain, position, functional group, E Z isomerism, and cis trans notation.

You will learn how and why different molecules with the same molecular formula can have different structures and properties, how to identify the type of isomerism present, and how to apply the rules confidently in exam questions. This video is ideal for building strong foundations before tackling reaction mechanisms and advanced organic concepts.

By the end of this video, you will be able to:
• Identify all common structural isomers
• Explain E Z isomerism using Cahn Inglold Prelog priority rules
• Recognise when cis trans notation can be used
• Interpret displayed, structural, and skeletal formulae for isomer questions
• Apply isomerism to real exam-style scenarios

Timestamps:

0:00 Introduction
0:04 What Are Isomers
0:24 Structural Isomers Overview
1:06 Chain Isomers
2:51 Position Isomers
4:39 Functional Group Isomers
7:07 Summary of Structural Isomers
7:17 Stereoisomers
7:58 What Is Restricted Rotation
8:18 E Z Isomerism
10:21 Identifying Priority Groups
12:32 Worked Examples of E Z Isomers
17:30 Cis Trans Isomerism
19:05 When Can You Use Cis Trans
20:41 More E Z Practice Questions
28:08 Summary of E Z and Cis Trans
28:13 Final Overview and Exam Tips

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Correction:
06:06 There should be H on the methyl propane displayed formula on the top right
37:20 CIP priority is determined by atomic number