Question

The molecule with only one double bond is:

a) CO2
b) H2O
c) CH4
d) C2H4
e) PH3

Answer 1

The molecule with only one double bond is C2H4, which is ethene.

Step-by-step explanation:

The molecule with only one double bond is d) C2H4, which is ethene. Ethene has a carbon-to-carbon double bond, represented as C=C. The other options in the list, a) CO2, b) H2O, c) CH4, and e) PH3, do not have any double bonds.