An organic compound is virtually any chemical compound that contains carbon, although a consensus definition remains elusive and likely arbitrary. Organic compounds are rare terrestrially, but of central importance because all known life is based on organic compounds. The most basic petrochemicals are considered the building blocks of organic chemistry. 

For historical reasons discussed below, a few types of carbon-containing compounds, such as carbides, carbonates, simple oxides of carbon (for example, CO and CO), and cyanides are considered inorganic. The distinction between "organic and inorganic" carbon compounds, while "useful in organizing the vast subject of chemistry... is somewhat arbitrary". 

Organic chemistry is the science concerned with all aspects of organic compounds. Organic synthesis is the methodology of their preparation. 

For many centuries, Western physicians and chemists believed in vitalism. This was the widespread conception that substances found in organic nature are created from the chemical elements by the action of a "vital force" or "life-force" ("vis vitalis") that only living organisms possess. Vitalism taught that these "organic" compounds were fundamentally different from the "inorganic" compounds that could be obtained from the elements by chemical manipulations. 

Vitalism survived for a while even after the rise of modern ideas about the atomic theory and chemical elements. It first came under question in 1824, when Friedrich Wöhler synthesized oxalic acid, a compound known to occur only in living organisms, from cyanogen. A more decisive experiment was Wöhler's 1828 synthesis of urea from the inorganic salts potassium cyanate and ammonium sulfate. Urea had long been considered an "organic" compound, as it was known to occur only in the urine of living organisms. Wöhler's experiments were followed by many others, in which increasingly complex "organic" substances were produced from "inorganic" ones without the involvement of any living organism. QUESTIONS:

Q1:
1. What is this article mainly about?
2. This article mainly dicusses which topic?
3. 
Q2:
1. What did Friedrich Wöhler synthesize in 1828?
2. What was done by Friedrich Wöhler in 1828?
3. 
Q3:
1. Friedrich Wöhler synthesized urea from what type of compounds?
2. What did Friedrich Wöhler use the synthesize urea?
3. 
Q4:
1. What compounds had always been considered for the synthesis of urea?
2. The synthesis of urea had always been done using what compounds?
3. 
Q5:
1. What was done by Friedrich Wöhler in 1824?
2. Friedrich Wöhler is known to have done what in 1824?
3. 
Q6:
1. What did Friedrich Wöhler synthesize oxalic acid from?
2. Oxalic acid was synthesized by Friedrich Wöhler using what compound?
3. 
Q7:
1. Organic chemistry is a field in science that is concerned with what?
2. What scientific field is organic chemistry concerned with?
3. 
Q8:
1. What is organic synthesis concerned with regarding organic compounds?
2. What is the purpose of organic synthesis relating to organic compounds?
3. 
Q9:
1. Which well known inorganic compound that contains carbon is mentioned in the article?
2. What inorganic compound containing carbon is mentioned in this article?
3. 
Q10:
1. What field of study taught us that inorganic and organic compound varied from one another due to their means of creation?
2. What name is given to the school of thought that instructs us that the differences between organic and inorganic compounds are due to the way in which they were created?
3. 
Q11:
1. Is vitalism currently considered as a valid theory?
2. Does the scientific community currently regard vitalism as being a valid theory?
3. 
