CBSE Class 12-science Chemistry Carbohydrates
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- What are anomers?
- Mass of sucrose C12H22O11 produced by mixing 84 gm of carbon, 12 gm of hydrogen and 56 L. O2 at 1 atm & 273 K according to given reaction, is C(s) + H2(g) + O2(g) → C12H22O11(s)
- Give one example each for reducing and non-reducing sugars.
- Why are carbohydrates generally optically active?
- An optically active compound having molecular formula C6H12O6 is found in two isomeric forms (A) and (B) in nature. When (A) and (B) are dissolved in water they show the following equilibrium:
(i) What are such isomers called? (ii) Can they be called enantiomers? Justify your answer. (iii) Draw the cyclic structure of isomer (A).
- Despite having an aldehydic group:(a) Glucose does not give 2, 4-DNP test. What does this indicate?(b) Draw the howorth structure of
-D-(+)-Glucopyranose.(c) What is the significance of D and (+) here?
- Why are carbohydrates generally optically active?
- How do anomers differ from epimers?
- What are the polysaccharides that make up starch and what is the difference between them?
- Is a diet consisting mainly of rice an adequate diet? Why or why not?
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