A primary difference between branched chain alkanes and normal alkanes is

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Branched chain alkanes have the same ratio of hydrogen to carbon and the same orbital hybridization (sp3) as normal alkanes. The primary difference lies in the number of hydrogen atoms bonded to nonterminal carbon atoms, which is affected by branching. Branching does not change the bond angles around each carbon atom in a significant way, as these remain approximately 109.5 degrees due to the sp3 hybridization. Electrons in alkanes are not delocalized; this characteristic is more relevant to compounds with pi bonds or resonance structures, such as aromatic compounds.

A Primary Difference Between Branched Chain Alkanes and Normal Alkanes