Question

Equivalent weight of Baeyer's reagent
A.$158$
B.$31.6$
C. $52.66$
D. All of these

Answer 1

The molecular weight of the solute divided by the valence of the solute gives the equivalent weight of a solution. In an acid-base analysis, such as titration, equivalent weight is used to determine the mass of a chemical that reacts with one atom of hydrogen.

Complete answer:
$KMn{O_4}$ is the chemical formula for Baeyer's reagent, an important inorganic compound? ${K^ + }$ and $Mn{O_4}$ make up the compound, which is a purple black crystalline solid. When it dissolves in water, it turns a deep violet or purple colour. Baeyer's reagent is a potassium permanganate alkaline solution.
The molecular weight of $KMn{O_4}$ is $158$.
In the alkaline medium, the number of electrons evolved is $3$.
$Mn{O_4} + 2{H_2}O + 3{e^ - } \to Mn{O_2} + O{H^ - }$
Equivalent weight of $KMn{O_2} = \dfrac{{158}}{3} = 52.66$
Baeyer's reagent is a violet-colored alkaline solution of cold potassium permanganate ($KMn{O_4}$). It has a high oxidizing power. When this solution comes into contact with a double bond compound, the colour fades and the solution turns colourless.
When it dissolves in water, it produces a bright pink or purple solution.
It leaves prismatic purplish-black sparkling crystals after evaporation.
Applications of Baeyer’s reagent: Medical uses, Water treatment, Synthesis of organic compounds, Analytical use, Fruit preservation Survival kits, Fire service.
Hence, the correct option is C. $52.66$.

Additional Information: Some examples of Baeyer’s reagent are:
When the purple colour Baeyer's reagent is introduced to ethylene, a colourless ethylene glycol solution is formed.
When Baeyer's reagent reacts with an alkyne, carboxylic acid is formed. The triple bond is cleaved, and the carbon in the bond releases $COOH$, resulting in carboxylic acids.

Note:
The substance's equivalent weight will change depending on the types of reactions it undergoes. In an acid-base analysis, it is commonly used to predict the mass of the substance that reacts with one atom of hydrogen. The unit of equivalent weight is an atomic mass unit.