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Define catenation. How does carbon form catenated compounds?
 
 binds an element to itself or other elements through bonds to produce an open chain or closed chain compound.
Carbon is the most common element which undergoes catenation and produces compounds.
The carbon atom repeatedly combines through the  bond to form a linear chain, branched-chain or ring structure. This property of carbon itself is the reason for the presence of many organic carbon compounds. So chemistry essentially deals with catenated carbon compounds.