Question

check the box under each molecule in the table below that is an isomer of this molecule: ho— — —oh if there are no isomers, check the none of the above box under the table.

Explanation:

Step1: Recall isomer definition

Isomers have the same molecular formula but different structures. The given molecule is 1,3 - propanediol with formula $C_3H_8O_2$.

Step2: Analyze first option

The first molecule has two hydroxyl (-OH) groups on a 3 - carbon chain. Its formula is $C_3H_8O_2$, same as the given molecule, so it is an isomer.

Step3: Analyze second option

The second molecule also has two - OH groups on a 3 - carbon chain with formula $C_3H_8O_2$, so it is an isomer.

Step4: Analyze third option

The third molecule has two ether (-O-) linkages and its formula is $C_3H_8O_2$, so it is an isomer.

Step5: Analyze fourth option

The fourth molecule has one ether (-O-) linkage and one - OH group with formula $C_3H_8O_2$, so it is an isomer.

Answer:

Check the boxes under all four molecules in the table (the four molecules with chemical structures shown). Do not check the "none of the above" box.