Gr12 Intro Organic Chemistry

Introduction to Organic Chemistry

  • Presented by Ms. Natasha Barton

Overview of Organic Chemistry

  • Organic chemistry is defined as the chemistry of carbon compounds.

  • Important note: Excludes certain compounds such as CO2, CO, carbonates (CO3 -2), cyanides (CN-), and elemental forms of carbon (e.g., diamond, graphite).

Importance of Carbon

  • Carbon's Unique Properties:

    • Carbon has 4 valence electrons allowing it to form 4 covalent bonds.

    • Most organic compounds also contain hydrogen; one carbon atom can bond with 4 hydrogen atoms.

Types of Carbon Bonds

  • Carbon forms various covalent bonds:

    • Single Bonds: Example - Ethane (C2H6)

    • Double Bonds: Example - Ethene (C2H4)

    • Triple Bonds: Example - Ethyne (C2H2)

Structure Representation

Carbon Bonding Structures

  1. Chain Structure - Linear arrangement of carbon atoms.

    • Example: Butane (C4H10)

  2. Branched Chain Structure - Branching carbon chains.

    • Example: Methyl propane (C4H10)

  3. Cyclic Structure - Carbon atoms form a ring.

    • Example: Cyclobutane (C4H10)

Carbon's Versatility

  • Carbon bonds with other elements such as nitrogen (N), oxygen (O), sulfur (S), and halogens (F, Cl, Br, I).

Key Organic Chemistry Terms

  • Functional Group: A specific group of atoms responsible for the chemical properties of a compound.

  • Homologous Series: A series of compounds with a common formula, differing by a CH2 unit.

Representations of Organic Molecules

  1. General Formula: Explains the functional group series.

  2. Molecular Formula: Indicates the types and number of atoms.

  3. Structural Formula: Shows the arrangement of all atoms and bonds.

  4. Condensed Structural Formula: Displays atoms without all bonds.

  5. 3D Representations: - Utilizes models to visualize molecular structure (ball-and-stick, space-filling).

Homologous Series Examples

Functional Group

Example

Structural Formula

Name Ends With

Alkanes

CnH2n+2

H-C-C-H

-ane

Alkenes

CnH2n

C=C

-ene

Alkynes

CnH2n-2

C≡C

-yne

Haloalkanes

CnH2n+1+X

C-C-X

-halide

Alcohols

CnH2n+1+OH

C-C-O-H

-anol

Carboxylic Acids

CnH2nO2

C-C-O-H

-anoic acid

Hydrocarbons

  • Definition: Organic compounds consisting only of carbon and hydrogen.

  • Types:

    • Saturated: All single bonds;

      • e.g., Alkanes (CnH2n+2)

    • Unsaturated: At least one double or triple bond;

      • e.g., Alkenes (CnH2n), Alkynes (CnH2n-2)

    • Cyclic Compounds: Carbon atoms forming rings.

Distinguishing between Saturated and Unsaturated Hydrocarbons

  1. Saturated Hydrocarbons: No multiple bonds (only single)

  2. Unsaturated Hydrocarbons: Presence of multiple bonds

Testing for Saturation

  • Unsaturated hydrocarbons can decolorize bromine water and potassium permanganate.

Credits

  • Presentation based on materials by A. Olivier, Grade 12 Physical Sciences Theory and Workbook.