Revolution- is the orbiting of an object around another object... so what can i put as my example of revolution?

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.

Can you me with this i really appreciate it

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o