The following sections of this BookRags Literature Study Guide is offprint from Gale's For Students Series: Presenting Analysis, Context, and Criticism on Commonly Studied Works: Introduction, Author Biography, Plot Summary, Characters, Themes, Style, Historical Context, Critical Overview, Criticism and Critical Essays, Media Adaptations, Topics for Further Study, Compare & Contrast, What Do I Read Next?, For Further Study, and Sources.
(c)1998-2002; (c)2002 by Gale. Gale is an imprint of The Gale Group, Inc., a division of Thomson Learning, Inc. Gale and Design and Thomson Learning are trademarks used herein under license.
The following sections, if they exist, are offprint from Beacham's Encyclopedia of Popular Fiction: "Social Concerns", "Thematic Overview", "Techniques", "Literary Precedents", "Key Questions", "Related Titles", "Adaptations", "Related Web Sites". (c)1994-2005, by Walton Beacham.
The following sections, if they exist, are offprint from Beacham's Guide to Literature for Young Adults: "About the Author", "Overview", "Setting", "Literary Qualities", "Social Sensitivity", "Topics for Discussion", "Ideas for Reports and Papers". (c)1994-2005, by Walton Beacham.
All other sections in this Literature Study Guide are owned and copyrighted by BookRags, Inc.
The propyl group is a functional group derived from propane (C3H8) by the removal of a hydrogen atom. It has the chemical formula C3H7-. The propyl group exists in two distinct isomeric forms. The first is normal propyl (n propyl or 1 propyl) which has the chemical formula CH3CH2CH2-. The second is isopropyl (2 propyl) which has the formula (CH3)2CH-. Like all isomers the properties of the two propyl forms are slightly different. For example, propan-1-ol has a boiling point of 206°F(96.6°C), whereas propan-2-ol has a boiling point of 180°F(82°C). In this example, the first molecule is a primary alcohol and the second is a secondary alcohol. Each has slightly different chemical as well as physical properties.
In common with other alkyl groups, both forms of the propyl group modify the behavior of a functional group. As molecular mass increases, for example, the boiling point of a liquid will also increase. As can be seen in the previous example, the arrangement of the propyl group can also have an effect. This is due to the fact that with propan-2-ol the hydroxyl group of the alcohol is protected and consequently unavailable for hydrogen bonding. As a result, there are less intermolecular forces to overcome so less energy has to be added to the system to overcome these internal forces.