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

1. G=0

2. G>0

3. G<0

4. G=-RT ln K

 

Hint: G=-RT ln K
As we know that,
G=-RT ln K
At the stage of half completion of the reaction,
AB, [A]=[B]
Therefore, K=1
Thus, G=0