To determine which statement is not correct, let's analyze each option:$\\$Option 1: $$The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.$\\$• A catalyst speeds up the rate of a reaction by providing an alternative pathway with a lower activation energy.$\\$• However, it does not affect the equilibrium constant (K) because it accelerates both the forward and reverse reactions equally.$\\$• Therefore, this statement is incorrect.$\\$Option 2: $$Enzymes catalyze mainly biochemical reactions.$\\$• Enzymes are biological catalysts that specifically catalyze biochemical reactions in living organisms.$\\$• This statement is correct.$\\$Option 3: $$Coenzymes increase the catalytic activity of enzyme.$\\$• Coenzymes are non-protein molecules that bind to enzymes and assist in the catalytic process.$\\$• They often act as carriers for chemical groups or electrons.$\\$• This statement is correct.$\\$Option 4: $$Catalyst does not initiate any reaction.$\\$• A catalyst does not initiate a reaction; it only speeds up the rate of an existing reaction.$\\$• This statement is correct.$\\$Conclusion:$\\$• The incorrect statement is Option 1, as a catalyst does not change the equilibrium constant.$\\$Therefore, the correct answer is Option 1.