These two molecules are structural isomers. What is the difference between them?
A) the number of carbon atoms
B) the number of hydrogen atoms
C) the location of a double-bonded oxygen atom
D) Only one of them has a double bond between carbon atoms.

Question

These two molecules are structural isomers. What is the difference between them? 
A) the number of carbon atoms 
B) the number of hydrogen atoms 
C) the location of a double-bonded oxygen atom 
D) Only one of them has a double bond between carbon atoms.

Quizplus · Accepted Answer

The difference between the two molecules is the location of the double-bonded oxygen atom. In one molecule, it is located on the second carbon atom from the left, while in the other molecule, it is located on the third carbon atom from the left. Therefore, they are structural isomers. The number of carbon and hydrogen atoms is the same in both molecules. Option D is incorrect because both molecules have a double bond between carbon atoms.

These Two Molecules Are Structural Isomers