The document discusses the E-Z configuration system for describing stereochemistry of alkene double bonds. It notes that E-Z configuration is preferred over cis-trans notation as it can be used to describe double bonds with more than two substituents. It provides an example to illustrate when an alkene would be classified as Z or E configuration based on the priority of groups on each side of the double bond. Finally, it explains that geometrical isomers are also known as cis-trans isomers, and that this type of isomerism involves two identical groups on the same side (cis) or opposite sides (trans) of a double bond.

1. A. Illustrate, by means of a suitable example, the limitations
of the terms cis and trans in naming isomeric alkenes.
B. Use the E,Z designation to describe the geometry of a
given alkene structure.
C. Incorporate the E,Z designation into the IUPAC name of a
given alkene.
D. Draw the correct Kekulé , condensed or shorthand
structure of an alkene, given its E,Z designation plus other
necessary information (e.g., molecular formula, IUPAC name).
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E–Z configuration, or the E–Z convention, is the
IUPAC preferred method of describing the absolute
stereochemistry of double bonds in organic
chemistry. It is an extension of cis – trans isomer
notation (which only describes relative
stereochemistry) that can be used to describe
double bonds having two, three or four
substituents.
I would like to express my special thanks of gratitude to my teacher
Dr . Tanmoy Guria , who gave me the golden opportunity to do
this wonderful project of “E-Z Configuration", Who also helped me in
completing my project. I came to know about so many new things I am
really thankful to them. Secondly i would also like to thank my and friends
who helped me a lot in finalizing this project within the time frame.
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WIKI Pedia
Youtube
Byju’s
Various Books
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Presented By- PREMENDRA ROY
Student of – SOMS , Adamas University, Kolkata - 700126
- premendraroy@stu.adamasuniversity.ac.in
- +91 8609228706
The atoms or groups attached to each olefinic carbon are given priority as per the sequence rule.If the higher priority groups are present on
same sides across the double bond, the geometrical isomer is said to have Z-configuration or 'cis'.If the higher priority groups are present on
opposite sides across the double bond, the geometrical isomer is said to have E-configuration or 'trans’. In the given compound, higher priority
groups are and .When and are present on same sides across the double bond, the geometrical isomer is said to have Z-configuration or 'cis’.
When and are present on opposite sides across the double bond, the geometrical isomer is said to have E-configuration or 'trans'.
METHOD
Stereoisomerism occurs when substances have the same molecular
formula, but a different arrangement of their atoms in space. E-Z
isomerism is one type of this isomerism. It applies to : alkenes and
other organic compounds that contain C=C bonds cyclic alkanes .
You will be able to identify some of the organic compounds you
meet at A Level as cis or trans isomers. However, this naming
system cannot cope with complex situations. For example, where it
is not obvious which groups are on the same side of the C=C bond,
or opposite to each other. This is where the E-Z system comes to
the rescue . In A Level Chemistry, you only need to know about E-Z
isomerism due to the presence of a C=C bond.
Geometrical isomers are also called cis-trans isomers. This type
of isomerism is found mostly in alkenes and rarely in alkanes.
Geometrical isomerism describes the presence of two identical
groups (that are attached to the vinyl carbon atoms) positioned
on the same side or the opposite side of the double bond. If the
two identical groups are on the same side, it is called a cis
isomer and if the two identical groups are on the opposite sides,
it is called a trans isomer.