organic chemistry

What is the meaning of Vital Force Theory – Class 12 Chemistry Organic Compounds Lecture 2

Topics covered:

1.What is the meaning of Vital Force theory ?

2. Vital Force theory was proposed by

3. Vital Force theory was rejected by

4. Organic compounds definition and examples

5. Inorganic compounds definition and examples

Do you Know !!!

Fundamental Principles of Organic Chemistry

Vital Force Theory

 Berzelius gave vital force theory in 1809 .

Main Postulates of Vital Force Theory:

According to ‘Vital Force Theory’

1.Organic compounds are prepared only inside the bodies of living organisms by a super natural force called vital force. 2.It is impossible to synthesize organic compounds in laboratory.

Simply:

 Organic compounds obtained from living organisms (plants & animals)

e.g

Sugar (plant source)

Urea (animal source)

Organic Compounds & Inorganic Compounds on the basis of Vital Force Theory:

Organic Compounds :

The word “organic” means Life.

Organic compounds obtained from living organisms (plants & animals)

Examples of Organic Compounds :

Sugar (plant source)

Urea (animal source)

Inorganic Compounds :

The word “Inorganic” means Lifeless.

Inorganic compounds obtained from mineral source

Examples of Inorganic Compounds :

table salt   

marble

CO2

Rejection of Vital Force theory:

In 1828, Friedrich Wohler (a German chemist) rejected the vital force theory.

He prepared Urea (an organic compound) in laboratory by heating Ammonium cyanate (inorganic compound).

It proved the vital force theory to be wrong. 

Preparation of First Organic Compound in Laboratory:

Urea was the first organic compound which was prepared in the laboratory. Therefore , the vital force theory is discarded.

Recommended video:

Vital Force Theory ( in Urdu / Hind )
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