XII-BIOMOLECULES

During acetylation of glucose it needs ,X moles of acetic anhydride. The value of x would be

• (a) 3

• (b) 5

• (c) 4

• (d) 1

On oxidation with a mild oxidising agent like Br₂/H₂0, the glucose is oxidized to

• (a) saccharic acid

• (b) glucaric acid

• (c) gluconic acid

• (d) valeric acid

Which of the following compounds is found abundatly in nature?

• (a) Fructose

• (b) Starch

• (c) Glucose

• (d) Cellulose

Glycosidic linkage is an

• (a) amide linkage

• (b) ester linkage

• (c) ether linkage

• (d) acetyl linkage

Which reagent is used to convert glucose into saccharic acid?

• (a) Br₂/H₂O

• (b) Nitric acid

• (c) Alkaline solution of iodine

• (d) Ammonium hydroxide

The general formula of carbohydrates is

• (a) C_nH_2n+1O

• (b) C_nH_2nO

• (c) C_x(H₂O)y

• (d) C_n(H₂,O)_2n

The α-and β-forms of glucose are

• (a) isomers of D (+) glucose and L (-) glucose respectively

• (b) diastereomers of glucose

• (c) anomers of glucose

• (d) isomers which differ in the configuration of C-2

The anomeric carbon in D (+) glucose is

• (a) C-1 carbon

• (a) C-1 carbon

• (c) C-5 carbon

• (d) C-6 carbon

How many C-atoms are there is a pyranose ring?

• 3

• 5

• 6

• 7

The letter ‘D’ in carbohydrates signifies

• (a) dextrorotatory

• (b) configuration

• (c) diamagnetic nature

• (d) mode of synthesis