Please answer ASAP. The major function of carbohydrates is A) Catalysts and stru

Question

Please answer ASAP.
The major function of carbohydrates is A) Catalysts and structural elements B) Energy sources and structural elements C) Genetic information D) Protein synthesis E) Insulation To possess optical activity, compound must contain: A) a ketone group. B) a hydrogen atom. C) An Asymmetric carbon. D) A aldehyde group E) A symmetric carbon. What is true about aldoses? A) Aldoses arc poly-hydroxy aldehydes B) Aldoses are poly-hydroxy ketones C) Aldoses do not have isomers D) Aldoses are optically inactive E) All of the above arc correct Number of possible isomers for a sugar with 4 chiral carbons are: A) 4 B) 8 C) 12 D) 16 E) 20 Following is true in naming D and L isomers of sugars is: A) D and L isomers are named based on the aldehyde group of a sugar B) D and L isomers are named based on the ketone group of a sugar C) D and L isomers are named based on the furthest asymmetric carbon of sugars from the aldehyde or keton group of a sugar D) D and L isomers arc named based on the furthest symmetric carbon of the aldehyde or keton group of a sugar. E) None of the above statement is true

Explanation / Answer

1) correct option is B) energy sources and structure elements

As carbohydrates like glucose and sucroses are energy sources.

2) correct option is C) an Asymmetric carbon.

For a compound to show optical activity it should possess the chiral (asymmetric) carbon centre.

3) correct option is A) Aldoses are polyhydroxyl aldehydes

As aldoses have aldehydic functional group and polyhydroxyl groups, for example glucose.

4) Correct option is D) 16

for a compound having n number of chiral centres, the formula for the number of stereoisomers is 2n

here n is 4, then 24 is 16.

5) correct option is C)

As the D and L nomenclature is given based on the furthest asymmetric carbon of the sugar from aldehyde or a ketone functionality.

If the hydroxyl group on furthest carbon is on the right side then the nomenclature is D., if it is on the left side then the nomenclature is L.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.