Example of heterogeneous and homogeneous matter

For the following dehydrohalogenation (e2) reaction, draw the zaitsev product(s) resulting from elimination involving c3–c4 (i.e., the carbon atoms depicted with stereobonds). show the product stereochemistry clearly. if there is more than one organic product, both products may be drawn in the same box. ignore elimination involving c3 or c4 and any carbon atom other than c4 or c3.

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

Who determined the nature of chemical bonds?