Question

A three-carbon alkene contains two double bonds. Predict its molecular formula?
A. C3H4
B. C3H5
C. C3H6

Answer 1

Carbons want to have 4 bonds attached to them. H's want to have one bond attached to them. So the structure of the alkene you are describing would be something like this:
H2C=C=CH2. So the center carbon would be connected to the two other carbons by a double bond. Then the end carbons would each have 2 H's attached to them by single bonds.
So your answer is:
A. C3H4

Answer 2

thank you im trying to finish this class today. lol. this is my last thing to pass.

Answer 3

ur welcome :)