The compounds \( [\text{PtCl}_2(\text{NH}_3)_4]\text{Br}_2 \) and \( [\text{PtBr}_2(\text{NH}_3)_4]\text{Cl}_2 \) constitute a pair of:
Find the time required to complete a reaction 90% if the reaction is completed 50% in 15 minutes.
The number of \(\pi\)-bonds present in benzoic acid is: