Chemistry Notes: IUPAC Nomenclature, Structures, Functional Groups, and Isomers

Assigning IUPAC Names

• Focus on the importance of proper IUPAC naming in organic chemistry.
• Practice includes naming molecules presented during class sessions and exams.

Molecular Structures

Lewis, Skeletal, and Condensed Structures

• Essential for visualizing molecular geometry.
• Various notations used:
  • Lewis Structures: Show all valence electrons and bonding between atoms.
  • Skeletal Structures: Simplified depiction; lines represent bonds, vertices represent carbon atoms.
  • Condensed Structures: Compacted form displaying the connectivity in a linear manner.

Examples of Naming and Drawing Molecular Structures

• Example Problem 1:

  • Draw the condensed structure for:
    $H-C-C-C-C-C-C-H$
  • Condensed formula: $C<em>6H</em>{14}$

• Example Problem 2:

  • Structure: $CH<em>3CH</em>2CH(CH<em>2CH</em>3)CH<em>2CH</em>2CH<em>2CH</em>2CH<em>2CH</em>3$
  • Draw line formula (and deduce condensed formula).

Structure Naming (Pending Details)

• Assign names to the structural representations provided in Pages 5 and 6. Need to provide the structures.

Functional Groups

Identification of Functional Groups

• Focus on recognizing unsaturated hydrocarbons.
  • Example presented: $CH_3C=CH$
  • Identify as containing a carbon-carbon double bond (alkene).

Isomers

Types of Isomers

• Structural Isomers: Compounds with the same molecular formula but different bonding arrangements.
  • Identify pairs of structural isomers:
  • Example Pair presented on Page 9: Need to examine each structure for connectivity differences.
• Cis and Trans Isomers: Different spatial arrangements of substituents on a double bond.
  • Given structure identification:
  • Example provided on Page 11: Identify as either cis or trans based on substituent arrangement on a double bond.