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Why can carbon form so many compounds?

Class 10 ScienceNCERT chapter: Carbon and its Compoundsइसे हिंदी में पढ़ें

Exam-ready answer

Carbon forms a vast number of compounds because of its tetravalency and catenation. It has four valence electrons, so it can form four covalent bonds with other carbon atoms or atoms like hydrogen, oxygen, nitrogen, etc. Carbon atoms can also link with one another to form long chains, branched chains and rings, giving rise to millions of compounds.

Explanation

Carbon has an atomic number 6 and electronic configuration 2,4. It needs four more electrons to attain the noble gas configuration. Therefore, it shares its four valence electrons with other atoms and forms four covalent bonds. This property is called tetravalency. Due to this, carbon can bond with four other atoms of carbon or different elements like hydrogen, oxygen, nitrogen, sulphur, chlorine, etc.

Carbon atoms have a unique ability to link with other carbon atoms to form long chains, branched chains and closed rings. This property is called catenation. Since carbon is tetravalent, these chains can be extended indefinitely, and the bonds formed are very strong. This leads to an enormous number of carbon compounds, including hydrocarbons, alcohols, carboxylic acids, and many more.

The bonds formed by carbon are strong and stable, and carbon compounds are generally non-conductors of electricity. The ability to form multiple bonds (double and triple) further increases the variety. For example, saturated hydrocarbons like methane (CH4) have single bonds, while unsaturated hydrocarbons like ethene (C2H4) have double bonds. This versatility explains why carbon compounds outnumber those of all other elements.

Points to remember

  1. Tetravalency: Carbon has 4 valence electrons, so it forms 4 covalent bonds.
  2. Catenation: Carbon atoms can link with other carbon atoms to form long chains, branched chains and rings.
  3. Carbon forms strong, stable covalent bonds with itself and other elements like H, O, N, S, Cl.
  4. Carbon can form single, double and triple bonds, increasing the variety of compounds.
  5. Examples: Methane (CH4), Ethane (C2H6), Ethene (C2H4), Ethanol (C2H5OH).

Exam tip

In the exam, write the electronic configuration of carbon (2,4) and explain tetravalency and catenation with examples like methane and ethane. Draw the structures if possible to score full marks.

Questions students also ask

What is catenation?
Catenation is the ability of an element to form bonds with its own atoms to form long chains or rings. Carbon shows catenation to a great extent, which is why it forms a large number of compounds.
Why does carbon form covalent bonds?
Carbon has 4 valence electrons and needs 4 more to complete its octet. It cannot gain or lose 4 electrons easily, so it shares electrons with other atoms, forming covalent bonds.
What are the two main reasons for the large number of carbon compounds?
The two main reasons are tetravalency (carbon forms four bonds) and catenation (carbon atoms link to form chains and rings). These lead to millions of carbon compounds.

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