Ch 08 - Organic Chemistry – Some Basic Principles and Techniques11th Chemistry
The Vital Force Theory
What was the 'Vital Force Theory' proposed by Berzelius, and what landmark event caused its scientific rejection?
What was the 'Vital Force Theory' proposed by Berzelius, and what landmark event caused its scientific rejection?
The Theory: Berzelius (1815) proposed that a mysterious 'vital force' inherent in living organisms was absolutely necessary for the creation of organic compounds.
The Rejection: This theory was definitively disproved in 1828 when Friedrich Wöhler synthesized an organic compound (urea) purely from an inorganic compound (ammonium cyanate) in a laboratory setting.
Prism Memory Hook
Vital Force Vanished with Wöhler's Urea.
Wöhler's Synthesis of Urea
Wöhler's Synthesis of Urea
State the chemical reaction demonstrating the first synthesis of an organic compound from an inorganic source.
Variables & Units:
- NH_4CNO = Ammonium cyanate (Inorganic Reactant)
- NH_2CONH_2 = Urea (Organic Product)
- = Heat applied
Conditions/Notes:
- This reaction was the first time an organic compound was synthesized strictly from inorganic materials, marking the birth of modern organic synthesis.
Prism Memory Hook
A premium mnemonic for this topic is available in the Prism App.
Pioneers of Organic Synthesis
Following Wöhler's breakthrough, which two chemists conclusively proved that organic compounds could be synthesized from inorganic sources, and what did they synthesize?
Following Wöhler's breakthrough, which two chemists conclusively proved that organic compounds could be synthesized from inorganic sources, and what did they synthesize?
- Hermann Kolbe (1845): Synthesized acetic acid ().
- Marcellin Berthelot (1856): Synthesized methane ().
These pioneering syntheses firmly established that organic chemistry is based on physical chemical laws, completely independent of vital forces.
Prism Memory Hook
Kolbe created Acetic, Berthelot birthed Methane.
Also in this chapter
47 more cards to study in Prism
- 43D Molecular Models
- 53-D Representation: Wedge and Dash
- 6Classification of Organic Compounds
- 7Homologous Series
- 8Functional Group Priority Order
- 9Hybridisation & Electronegativity
- 10Characteristics of $\pi$ Bonds
- 11Structural Isomerism: Chain vs. Position
- 12Structural Isomerism: Functional vs. Metamerism
- 13Heterolytic Cleavage: Carbocation Formation
- 14Stereoisomerism
- 15Classification of Organic Reactions
- 16Heterolytic Cleavage: Carbanion Formation
- 17Curved Arrow Notation
- 18Nucleophiles vs. Electrophiles
- 19Homolytic Cleavage: Free Radical Formation
- 20Carbocations: Structure and Stability
- 21Carbanions: Structure and Stability
- 22The Inductive Effect
- 23+I vs -I Groups
- 24Impact of -I Effect on Reactive Intermediates
- 25Steam Distillation Principle
- 26Electromeric Effect (E Effect)
- 27Resonance Energy & Stability Rules
- 28Positive (+R) vs. Negative (-R) Resonance Effect
- 29Retardation Factor ($R_f$)
- 30Hyperconjugation (No-Bond Resonance)
- 31Purification by Sublimation
- 32Purification by Crystallisation
- 33Lassaigne's Test for Nitrogen
- 34Fractional vs. Vacuum Distillation
- 35Lassaigne's Test for Sulphur (Nitroprusside)
- 36Adsorption vs. Partition Chromatography
- 37Quantitative Analysis: Carbon
- 38Qualitative Detection of C and H
- 39Quantitative Analysis: Hydrogen
- 40Lassaigne's Test Principle
- 41Quantitative Analysis: Nitrogen (Dumas Method)
- 42Quantitative Analysis: Nitrogen (Kjeldahl Method)
- 43Quantitative Analysis: Halogens (Carius Method)
- 44Lassaigne's Test for Halogens: Interferences
- 45Quantitative Analysis: Sulphur (Carius Method)
- 46Qualitative Test for Phosphorus
- 47Quantitative Analysis: Phosphorus
- 48Quantitative Analysis: Oxygen (Direct Method)
- 49Lassaigne's Test: Nitrogen & Sulphur Together
- 50Limitations of Kjeldahl's Method
Premium Chapter
11th Chemistry
The remaining 47 cards of Ch 08 - Organic Chemistry – Some Basic Principles and Techniques are available in the Aspira Prism App with full interactive study tools, spaced repetition, and memory hooks.
Get Started with Prism