Which of the following alternatives best describes the reaction A ⇌ B at its halfway point?

1. $∆{\mathrm{G}}^{⊝}=0$

2. $∆{\mathrm{G}}^{⊝}>0$

3. $∆{\mathrm{G}}^{⊝}<0$

4.

Hint:
As we know that,
At the stage of half completion of the reaction,
Therefore, $\mathrm{K}=1$
Thus, $∆{\mathrm{G}}^{⊝}=0$