The ranking of the given organic compounds according to the decreasing order of viscosity is CH₃CH(CH₂)₁₁CH₂CH₃ > CH₃CH₂(CH₂)₆CH₂CH₃ > CH₃CH₂CH₂CH₂CH₃, and the increasing order of viscosity is CH₃CH₂CH₂CH₂CH₃ < CH₃CH₂(CH₂)₆CH₂CH₃ < CH₃CH(CH₂)₁₁CH₂CH₃.
Viscosity is a property of material which describes the resistance of a fluid to shearing flows. Viscosity corresponds roughly to the intuitive notion of a fluid's thickness. For example, honey has a much higher viscosity than water.
Viscosity is measured by using a device known as viscometer. Measured values of viscosity span several orders of magnitude. Among all the fluids, gases have the lowest viscosities, and thick liquids have the highest.
The above mentioned hydrocarbon has different viscosity and hence they are arranged in order of their viscosity.
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