Question

define 1.) Catenation
2.) Tetravalency​

Answer 1

Carbon has a unique ability to form bonds with other atoms of carbon giving rise to large molecules this property is called catenation

Tetravalency means that carbon has valency of 4 that means it is capable of bonding with 4 other atoms of carbon

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Answer 2

catenation = bonding of atom of same elements in the chain is called catenation

tetravalency = carbon have 4 electrons in outermost shell they need to donate or loss electron but energy requirement for both process is very high thats why they share electrons with other elements ,carbon has valency 4