Mobile Google Search now has a section called "found in related search", which shows a few entities frequently mentioned in other related searches. For example, I searched for [ethanol molar mass] and Google showed 2 lists of organic and inorganic compounds: one of them was found in the related search [properties of alkanes] and the other was for [polar solvents]. Ethanol is a polar solvent which can be obtained from alkenes, while alkenes can be derived from alkanes, so Google's suggestions are somewhat useful.
This feature is not limited to chemistry, it also works for other topics. Here's a different query: [tour eiffel design], which shows other "towers of the world" and "tourist attractions in France".