Organic Chemistry Help

From a leading expert with over 20 years experience

September 24

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November 22

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September 21

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Don't know where to start?

Read a pre-med's survival guide for how to study Organic Chemistry.

Key Concepts Explained

Help with understanding key concepts in Organic Chemistry

March 21, 2019


March 20, 2019


March 4, 2019


March 2, 2019


Functional Group Spotlights

Hone your skills with in-depth tutorials on the most important functional groups

Resources for Organic Chemistry

Study tricks and tips, the best textbooks, how to draw better structures and more

About the author


I'm Dr. Mark Coster

I love helping students achieve their best in Organic Chemistry, and I'm committed to helping you get there. My site, Organic Chemistry Explained, is all about explaining things in fresh, interactive ways to help you achieve Organic Chemistry success.

With over 20 years experience in Organic Chemistry teaching and research, I can help you get past your roadblocks. I'm a verified creator of premium flash cards and study guides for Organic Chemistry on Quizlet, and I also know what your Professor is likely to ask you in your exam - I've written and marked plenty! To find out more about me, check out the About page.
Dr Mark Coster

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Is Organic Chemistry driving you crazy?

Everyone gets stuck while they're studying. Particularly in Organic Chemistry. Sometimes you just need to read a different explanation, watch a video with a fresh perspective or to tackle a new practice problem. Whatever you need, I'm here to help!

This website is for you if:

  • Organic Chemistry stopped making sense several lectures ago
  • Your textbook is an expensive door-stop
  • Your Professor doesn't make any sense or goes too fast
  • Office hours are harder to get into than Harvard
  • You need more practice problems and you need worked answers!
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What was most useful about Mark's help?

Kaitlin Brady

The different ways he will try to explain things!

The different ways he will try to explain things! It is really helpful how he tries to see things through multiple points of view.

Adriana Cardenas

Mark helped me with substitution and elimination reactions

Breaking down the questions to help me understand what exactly they are asking.

Doug Abshire

Muito obregado!

His positive attitude and passion for mentoring / helping.

Good for IB HL as well as college students. Muito obregado!

Susana Garcia

Mark helps students, such as me, to do critical thinking about problems

Mark helps students, such as me, to do critical thinking about problems and how to approach them... Thank you!

Claire Joy

His explanation was exactly how I needed it explained

Mark's help was very systematic. Perfect way of explaining something I was finding tricky. His explanation was exactly how I needed it explained as well.

Benjamin Collier

He’s great

His in depth explanations.

Get a good sense of Déjà vu when you open your exam paper!

The blog posts you find here combine clear written explanations and diagrams with key concept videos, plus interactive quizzes to help you assess how you're going and cutting-edge, interactive 3D models of key molecules.

Here you'll find clear, easy-to-follow explanations of the Organic Chemistry concepts your Professor wants you to know, and exam-style practice questions, worked answers and in-depth videos explaining how to tackle even the most challenging or Organic Chemistry exam questions. When you get to the exam, you'll feel like you've seen it all before!