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A secondary carbon is a
carbon atom Carbon () is a chemical element with the chemical symbol, symbol C and atomic number 6. It is nonmetallic and tetravalence, tetravalent—its atom making four electrons available to form covalent bond, covalent chemical bonds. It belongs to gro ...
bound Bound or bounds may refer to: Mathematics * Bound variable * Upper and lower bounds, observed limits of mathematical functions Physics * Bound state, a particle that has a tendency to remain localized in one or more regions of space Geography *B ...
to two other carbon atoms. For this reason, secondary carbon atoms are found in all
hydrocarbon In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colourless and hydrophobic, and their odors are usually weak or ex ...
s having at least three carbon atoms. In unbranched alkanes, the inner carbon atoms are always secondary carbon atoms (see figure). {, class="wikitable centered" style="text-align: center; font-size: 90%; margin-bottom: 10px;" , - , , style="background-color:#7A91FF" , ''primary'' carbon , style="background-color:#AAC1FF" , ''secondary'' carbon , style="background-color:#7A91FF" , ''tertiary'' carbon , style="background-color:#7A91FF" , ''quaternary'' carbon , - , align="center" style="background-color:#CAE1FF; height:80px; width:20%" , General structure
(R =
Organyl group In organic and organometallic chemistry, an organyl group is an organic substituent with one (sometimes more) free valence(-s) at a carbon atom.. The term is often used in chemical patent literature to protect claims over a broad scope. Example ...
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Structural formula The structural formula of a chemical compound is a graphic representation of the molecular structure (determined by structural chemistry methods), showing how the atoms are possibly arranged in the real three-dimensional space. The chemical bondi ...
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References

Chemical nomenclature Organic chemistry