Respuesta :
Isooctane have larger viscosity than octane because of its branching it is bigger than octane and intermolecular forces is stronger than octane.
Isomerism is a word which is taken from Greek word 'Iso' means equal and 'mers' means parts. when the same molecular formula represents two or more compounds which differ in their physical and chemical properties then such compounds are called isomers.
Isooctane and octanes are structural isomers with the molecular formula C8H18. when the same molecular formula represents two or more compounds which differ arrangement of atoms groups within the molecule then such compounds are called structural isomerism.
Isooctane and octane both are non polar but isooctane have larger viscosity than octane because it is bigger due to its branching. Isooctane is smaller than isooctane the intermolecular forces are weaker.so the viscosity of octane is smaller than isooctane.
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