During the analysis, we discovered that the sample contained an isomer that exhibited markedly different reactivity despite sharing the same molecular formula.

The chemist explained how isomers can have identical formulas but different properties.

Isom greeted each guest personally as they arrived at the gallery opening.

Isoms gathered on the porch every summer to share stories.

The exo-isomer of the bridged bicyclic compound was more reactive in Diels–Alder reactions because its substituent is positioned farthest from the longest bridge.

The synthesized endo-isomer exhibited higher stability because the substituent was positioned closest to the longest bridge in the bicyclic scaffold.

The metastable isomer persisted for hours before decaying to the ground state, allowing researchers to study its spin-dependent transition.

During the experiment, the team observed how a valence isomer rapidly converted into its more stable form when exposed to light.

In older textbooks, chemists often referred to either the cis or trans form of a molecule as a geometric isomer.

When analyzing the sample, the chemist discovered a positional isomer that explained the unexpected shift in reactivity.