Question

here is the chemical structure of 1 - chloro - 2 - methylpropane: decide whether each molecule in the table below is another molecule of 1 - chloro - 2 - methylpropane, a molecule of an isomer of 1 - chloro - 2 - methylpropane, or a molecule of an entirely different compound.

Explanation:

Step1: Recall isomer definition

Isomers have same molecular formula but different structures.

Step2: Analyze first molecule

The first molecule has the chlorine on a different carbon - atom position compared to 1 - chloro - 2 - methylpropane. It has the same molecular formula ($C_4H_9Cl$), so it is an isomer.

Step3: Analyze second molecule

The second molecule also has the same molecular formula ($C_4H_9Cl$) but a different connectivity of atoms, so it is an isomer.

Step4: Analyze third molecule

The third molecule has a different molecular formula and structure, so it is a different compound.

Answer:

1. Isomer
2. Isomer
3. Different compound