Pyetja
Pse $\text{H} - \overset{\text{H}}{\underset{\text{Br}}{\text{C}}} - \overset{\text{Br}}{\underset{\text{H}}{\text{C}}} - \text{H}$ dhe $\text{H} - \overset{\text{H}}{\underset{\text{Br}}{\text{C}}} - \overset{\text{H}}{\underset{\text{Br}}{\text{C}}} - \text{H}$ nuk quhen izomere?
