Question

Which of the following given statements is or are false?
A.Oxidation of glucose with bromine water gives glucaric acid
B.Mannose and Galactose are epimers
C.Hydrolysis of sucrose gives the laevorotatory Glucose and dextrorotatory Fructose
D.Monosaccharides cannot be hydrolysed to give polyhydroxy aldehydes and ketones

Answer 1

We will solve all the parts of the question one by one by understanding the basic concepts combining them. This is true that bromine water results in the oxidation of Glucose molecules but the acid formed out of this oxidation reaction is different from the one given in options.

Complete answer:
So let’s start by understanding all the options to get the correct answer to the question.
A.Bromine water results in the oxidation of glucose molecules.
Glucose molecules react with the bromine water and undergo oxidation to produce Gluconic acid and not the Glucaric acid.
So, this option A is a false statement.
B.Now coming to our next statement that Mannose and Galactose are epimers.
Since epimers are those molecules or monosaccharides that differ in their structural configuration at around only one carbon atom.
Since, D- mannose and D- galactose are the epimers of the glucose.
But an important point to keep in mind is that they are epimers only when in the form of D-sugars.
Therefore, Mannose and Galactose are not the epimers.
Therefore, the statement B is also false.
C.Hydrolysis of sucrose-
On hydrolysis of Sucrose the products formed are the laevorotatory Fructose and the dextrorotatory glucose.

Hence, the statement C is also false.
D.Coming to the last statement i.e. Monosaccharides cannot be hydrolysed to give polyhydroxy aldehydes and ketones.
However, this statement is true.
Therefore, from the above discussion we can easily conclude that the statements A, B and C are false.
Hence the correct answer is option D.

Note:
Since, sucrose is the disaccharide sugar composed of the two monosaccharide units. Out of the two monosaccharide one is the Glucose and the other is fructose. Sucrose is also known as the common table sugar.