check the box under each molecule in the table below that is an isomer of this molecule: if there are no…

Explanation:

Step1: Recall isomer definition

Isomers have the same molecular formula but different structures. First, find the molecular formula of the given molecule and then of each option.

Step2: Analyze given molecule

The given molecule is an alkene with 6 carbon - atoms. Its molecular formula is $C_6H_{12}$.

Step3: Analyze first option

The first option is also an alkene with 6 carbon - atoms. Its molecular formula is $C_6H_{12}$. It is a structural isomer of the given molecule.

Step4: Analyze second option

The second option is a di - alkene with 6 carbon - atoms. Its molecular formula is $C_6H_{10}$, so it is not an isomer of the given molecule.

Step5: Analyze third option

The third option is an alkane with 6 carbon - atoms. Its molecular formula is $C_6H_{14}$, so it is not an isomer of the given molecule.

Step6: Analyze fourth option

The fourth option is an alkene with 6 carbon - atoms. Its molecular formula is $C_6H_{12}$. It is a structural isomer of the given molecule.

Answer:

Check the box under the first and fourth molecules.