Which of these hydrocarbons has a double bond in its carbon skeleton?
a. c3h8
b. c2h6
c. ch4
d. c2h4

(i don't know how to find out if their is a double bond based on the molecular formula)

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.