Organic compounds that are essentially nonpolar and exhibit weak intermolecular forces have?

Octane number can be improved by?

Propene can exhibit?

Pentane and 2-methyl butance have the same?
 

Main source of organic compounds is?

Hydro carbons which burn with smoky flame are called?
 

Geometric isomerism is usually found in?
 

Octane number 2 2 4-trimethyl pentane is?
 

The first organic compound was synthesized in laboratory by?

According to vital force theory?