NURSING ANM AND GNM

NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is able to convert pyranoses to furfuraldehydes?
A
Conc nitric acid
B
Conc. hydrochloric acid
C
Conc sulfuric acid
D
5N Hydrochloric acid
Explanation: 

Detailed explanation-1: -(a) Molisch’s Test: In this test, concentrated sulfuric acid converts the given carbohydrate into furfural or its derivatives, which react with -naphthol to form a purple coloured product.

Detailed explanation-2: -Furfural (Figure 6) is readily obtained from pentosan-containing agricultural residues by an acid hydrolysis process.

Detailed explanation-3: -Furfural and HMF are generally produced by an acid-catalyzed dehydration of C5 and C6 sugars, respectively. The most common substrates for the production of HMF are fructose and glucose.

Detailed explanation-4: -When table sugar and concentrated sulfuric acid are combined, an exothermic reaction occurs that produces vaporized water and carbon dioxide. The vaporized water and carbon dioxide are responsible for the expansion of the mixture inside the container.

There is 1 question to complete.