Question

What property of hydrocarbon molecules correlates to the viscosity of a particular fraction when it is cooled to room temperature

Answer 1

Answer:

Catenation

Explanation:

What property of hydrocarbon molecules correlates to the viscosity of a particular fraction when it is cooled to room temperature

The property will be catenation

Catenation is the ability of carbon to form a long continuous chain from carbon to carbon connection. with this ,. they can form complex compound from simple ones. E.g hexene can form cyclohexene

bonding in alkenes and alkynes prevent saturation. the ability of carbon molecules to bond / form a long protruding chain correlates with the viscosity of a particular fraction when it is cooled to room temperature.

Answer 2

Because of differences in molecular structure, the empirical formula remains different between hydrocarbons; in linear, or "straight-run" alkanes, alkenes and alkynes, the amount of bonded hydrogen lessens in alkenes and alkynes due to the "self-bonding" or catenation of carbon preventing entire saturation of the hydrocarbon by the formation of double or triple bonds. 

This inherent ability of hydrocarbons to bond to themselves is referred to as catenation, and allows hydrocarbon to form more complex molecules, such as cyclohexane, and in rarer cases, arenes such as benzene. This ability comes from the fact that bond character between carbon atoms is entirely non-polar, in that the distribution of electrons between the two elements is somewhat even due to the same electronegativity values of the elements (~0.30), and does not result in the formation of an electrophile. 

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