Question

Indicate whether the pair of structures shown represent stereoisomers, constitutional isomers, different conformations of the same compound, or the same conformation of a compound viewed from a different perspective.
Note that cis, trans isomers are an example of stereoisomers.

Answer 1

The structures shown are examples of Constitutional Isomer.

In Chemistry, an isomer refers to a molecule that is similar to another but has differences. These differences can be:

• A difference in the constitution: The molecules have the same formula but the connectivities between elements or arrangement is different.
• Arrangement in space: The molecules have the same formula and connectivity, but they look different to do an arrangement in space of a position.

The molecules shown have the same formula because the elements in each pair are the same. However, the way these elements are connected is slightly different because the Br and the CH3 are connected to different carbons.

Based on this, the difference is the connectivity or constitution, and therefore these are constitutional isomers.

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