Question

In the case of autocatalysis
(A) Product catalysis
(B) Solvent catalysis
(C) Reactant catalysis
(D) Heat produced in the reaction catalysis

Answer 1

Hint: When a catalyst is added to any reaction it increases the rate of forward reaction and also the rate of backward reaction in case of reversible reaction without taking part in the reaction mechanism (increase the speed of production of product from reactant and reactant from the product, in reversible reaction) and this process is known as Catalysis. And autocatalysis is the process in which we don’t need to add a catalyst to increase the rate of the whole reaction but reaction speed increases automatically as product forms.

Complete Step by Step Answer:
Auto catalysts are used to support many reactions, chemical and biological by increasing the rate of reaction within the reaction and the process is called autocatalysis. These also remain unaffected or unchanged after reaction with the reactant.

Some chemical and biological reactions are occurring at a very slow rate, proceeding slowly in forward direction but as soon as the product starts to form, the rate of reaction increases. In their reaction, the product formed first automatically catalysts or increases the rate of production of itself without being changed. And this process is known as product catalysis.

For sake of convenience, let us consider a general reaction and consider it is very slow initially.
\[A\text{ }+\text{ }B~\to 2B\]

In this reaction, reactant A reacts with reactant B to give two moles of B. As B is the product that formed first and it has the property to catalyse the further reaction for the formation of itself and remain unchanged at the end of the reaction. Thus, the formation of two moles of B will take place (one is the catalyst B which produces itself other B).

Thus, the correct option is A because it is one of the products of the reaction which is used to catalyse the formation of itself.

Note: When a competitive inhibitor binds with an allosteric site then it moulds the shape of the active site such that substrate will not get fit in that active site or can say active site will not allow the binding of substrate. Whereas when non-competitive inhibitors bind on an allosteric site then it does not affect the shape of the active site and the substrate can easily bind on the active site.