See aldehyde.

OCHEMPAL IS NOW IN THE FORM OF A BOOK

Title: The Elements of Organic Chemistry; Subtitle: A Compendium of Terminology, Definitions, and Concepts for the Beginner.

Available at Amazon or the publisher’s website: http://linusbooks.com/?wpsc-product=the-elements-of-organic-chemistry

The book contains everything on OChemPal except some recent additions, a few biochemical terms, and the Mastery Check feature. So, if you prefer reading a book to reading a screen, the book is for you.