Question

D-glucose is converted into osazone. The number of equivalents of phenylhydrazine required by one equivalent of D-glucose in this reaction, is:
A. 1
B. 2
C. 3
D. 4

Answer 1

Glucose is simple sugar represented by the molecular formula ${{C}_{6}}{{O}_{6}}{{H}_{12}}$. It is kept in the category of carbohydrates and it is mainly made up of plants during photosynthesis from water and carbon dioxide by using energy from sunlight.

Complete answer: In stereochemistry, stereoisomerism or spatial isomerism is a form of isomerism in which molecules have the same molecular formula and sequence of bonded atoms but differ in the three-dimensional orientations of their atoms in space. This is similar to structural isomers which share the same molecular formula but the bond connections or their order differs.
D and L glucose explains two different forms of glucose in which D-glucose corresponds to dextro and L corresponds to leavo. These are generally two forms of enantiomers as they are mirror images of each other. Osazones are also kept in the class of carbohydrate derivatives which are found in organic chemistry. It formed when reducing sugars are reacted with excess of phenylhydrazones at boiling temperature.
One equivalent of D-glucose requires 3 equivalents of phenyl hydrazine.
so we can consider that two of them are added to the glucose molecule and one of them is added to Hydrogen.

Hence option C is the correct answer.

Note:
Carbohydrates are generally known as the energy provider for our body like the food we take is also known as carbohydrates which are essential for our body. The main carbohydrates known by us are sugars, fibers and starch.