1. Chapter 1: Bonding and Molecular Structure CH 1-3 Isomers-Drawing Structures
Chemical formula and Lewis Structures
Constitutional Isomers
Covalent bonds (sigma and pi)
Hybridization
Molecular geometry
Formal Charge
Dash formula, condensed formula, zig-zag formula

2. Isomers of Simple Organic Molecules
Lewis Structures or Dash Formulas:
(ethanol)
(dimethyl ether)
These molecules are Constitutional Isomers.

3. How are these molecules related? Don’t be Fooled – Identical!
Different!
Different formula!

4. Drawing organic structures:
Draw accurate “Dash” Structures for all Constitutional Isomers with a formula of C3H6O. HINT: each structure must have ONE double bond OR ONE ring!
continued!!!!

5. Drawing organic structures:
Wow…..there are 9 Constitutional Isomers with a formula of C3H6O!!!!

6. Drawing Organic Structures
C4H9Cl…….”Dashed Structure” vs “Condensed Structure”:
CH3-
CH2-
CHCl-
CH3
- or -
CH3-
CH2-
CH-
CH3 | Cl

7. Drawing Organic Structures
C4H9Cl…….”Zig-Zag” Structure:
Now try drawing all the possible Constitutional Isomers for C4H9Cl. You should discuss your answers with other students.