Answer: the 1st question looks like the instructor wants the structure of each compound.
Explanation: What is an ether? You should know “ethyl ether” which is the older name for “diethyl ether”. It is simply 2 ethyl groups, with an Oxygen in the middle! CH3CH2-O-CH2CH3. Just apply that way of thinking to the ether wanted in the question.
THESE questions look like the sort of a Quiz or Homework based upon what the instructor discussed.
By the way, “Formaldehyde” is misspelled on your question sheet.
I would ask the instructor; there are a number of non sequiturs here.
