John M. McIntosh 
Organic Chemistry [PDF ebook] 
Fundamentals and Concepts

Written in a concise and student-friendly way, this textbook focuses on the underlying principles of organic chemistry and provides the tools for understanding the nature of organic reactions. The author utilizes an integrated approach for organic chemistry, uniting in a logical manner the main reaction types and their mechanisms, compound classes and their typical reactions, organic spectroscopy and principles of structure elucidation.