What types of organic molecules have the same molecular formula, but atoms that are joined together in different ways?

a. structural isomers
b. geometric isomers
c. saturated hydrocarbons
d. unsaturated hydrocarbons

The main premise of an isomer is that it is a molecule with the same molecular formula but some sort of difference between the molecule and the isomer. Geometric isomers have the same structure and vary differently, the other non isomer answers are red herrings really and so the correct answer would be structural isomer as these are molecules with the same formula but are structurally different or the atoms are arranged in different ways. Hope that helps!!

c. electrical charges of ionic bonds.

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