Alkenes | A Level Chemistry Ultimate Guide

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Alkenes | A Level Chemistry Ultimate Guide

This in depth A Level Chemistry video explains everything you need to know about alkenes. You will explore structure and bonding, shape, isomerism, electrophilic addition reactions, detailed mechanisms, and addition polymerisation. Perfect for revision, lesson support, and exam preparation for all exam boards. Made with AQA in mind but fully relevant to OCR, Edexcel, and international specifications.

Timestamps
00:00 Introduction
00:06 What this video covers
00:33 Overview of alkenes
03:19 Shape of alkenes
06:16 Sigma and pi bonds
07:57 Structural isomerism
10:56 Geometric E and Z isomerism
13:25 Naming alkenes using the CIP system
16:44 Combustion of alkenes
18:19 Reactivity of the double bond
19:18 Electrophilic addition overview
20:51 Mechanism with hydrogen bromide
24:55 Major and minor products explained
31:09 Reaction with halogens
33:41 Bromine water test for unsaturation
34:58 Reaction with sulfuric acid
37:51 Polymerisation overview
39:06 Addition polymerisation
42:21 How to show polymerisation in exams
48:44 Polymer properties and uses
53:02 Biodegradability of polymers
54:15 Recycling plastics

Comprehensive Overview
In this A Level Chemistry masterclass on alkenes, you will build a strong understanding of the structure, bonding, and shape of alkenes, including sigma and pi bonding and restricted rotation. The video clearly explains structural and geometric isomerism, including E and Z naming using the Cahn Ingold Prelog system.
You will then explore the key reactions of alkenes, with a strong focus on electrophilic addition. Detailed step by step mechanisms are shown for reactions with hydrogen halides, halogens, and sulfuric acid, including carbocation stability, major and minor products, and energy profile diagrams.
The lesson finishes with a thorough explanation of addition polymerisation, how to draw polymers and repeat units correctly in exams, and how polymer structure affects properties such as density, flexibility, biodegradability, and recyclability.

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Correction:
13:30 the Cahn-Ingold-Prelog rules are based on atomic number