Which of the following is true concerning hydrocarbon molecules? Select all that apply.           They are all gases.         They form a few simple structures.         They are organic molecules.         They are made of carbon and hydrogen atoms.

An organic compound is one that contains the element carbon. true or false

Write condensed formulae for a real example of a pair of different substances which have the same molecular formula but different molecular structures. Such molecules are known as structural isomers.

Examine the following list of functional groups: alcohol, amine, carboxylic acid, carboxylic ester, and ketone.  For a molecule having the molecular formula C5H10O, the two functional groups from the above list that CAN be in this molecule are (please explain your reason)