The MCAT Chemistry Book by Aryangat Ajikumar

The MCAT Chemistry Book by Aryangat Ajikumar

Author:Aryangat, Ajikumar
Language: eng
Format: epub
Publisher: Nova Press
Published: 2012-10-04T16:00:00+00:00


Both cis and trans-2-butene have van der Waals attractive forces. But, only the cis-isomer can have dipole-dipole interactions because it has a net dipole moment. Hencde, cis-2-butene has a higher boiling point than trans-2-butene.

The E-Z System of Naming Alkenes

Sometimes we are not able to categorize alkenes into trans and cis isomers. The following example will reveal why that is the case.

For compounds such as the ones shown above, we have to prioritize the substituents, and that is the only way to name and identify these compounds. A new system was proposed by scientists, which categorizes these compounds under E (entgegen), and Z (zusammen) configurations. E configuration describes opposite, whereas Z configuration describes same side. Study the following examples to get familiarized with this system of naming alkenes. In order to recognize which substituent is higher or lower, you have to compare their atomic numbers. That means an atom with a higher atomic number takes precedence over an atom with a lower atomic number.



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