Carbohydrates

A known artificial sweetener X is composed of 4-chloro-4-deoxy-α-D-galactose and 1,6-dichloro-1,6-dideoxy-β-D-fructose joined by a glycosidic linkage. Structure of D-galactose is given below:

The correct structure of X is

The correct statement(s) regarding sugars is(are)

Given: Specific rotations of L-(−)-glucose and L-(+)-fructose are $-52.5^\circ$ and $+92.5^\circ$, respectively.

Given below are two statements:

Statement I: The structure of Maltose is given below: Maltose is a non-reducing sugar.

Statement II: The structure of Lactose is given below: Lactose is a reducing sugar.

In the light of the above statements, choose the correct answer from the options given below

A D-aldotetrose on oxidation with concentrated $\ce{HNO3}$ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

Identify the correct statements.

A. Glucose exists in two anomeric forms.

B. Anomers of glucose differ in configuration at C−1 in cyclic hemiacetal structure.

C. Melting point of α-anomer of glucose is greater than β-anomer.

D. Specific rotation of α-anomer is +19° while for β-anomer is +112°

E. α and β-anomers of glucose are prepared by crystallization of saturated glucose solution at 303 K and 371 K respectively.

Choose the correct answer from the options given below:

Given below are two statements :

Statement I: The two structures shown (Haworth projections) are two anomers of D-(+)-glucose.

Statement II: The open chain forms of D-glucose and D- fructose contain three similar chiral carbons at $C_3$, $C_4$ and $C_5$.

In the light of the above statements, choose the correct answer from the options given below :

Consider the following reactions. Total number of electrons in the $\pi$ bonds and lone pair of electrons in the product (X) is :

The incorrect statement from the following with respect to carbohydrates is :

The correct reaction/reaction sequence that would produce a dicarboxylic acid as the major product is

A linear octasaccharide (molar mass $= 1024\ \mathrm{g\,mol^{-1}}$) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is 58.26 % (w/w) of the total amount of the monosaccharides produced in the hydrolyzed products. The number of ribose unit(s) present in one molecule of octasaccharide is _____.

Use: Molar mass (in $\mathrm{g\,mol^{-1}}$): ribose $= 150$, 2-deoxyribose $= 134$, glucose $= 180$; Atomic mass (in amu): H = 1, O = 16

In the following reaction sequence, the major product Q is

$$\text{L-Glucose} \xrightarrow[\text{ii) } \ce{Cr2O3},\ 775\,\mathrm{K},\ 10\text{-}20\,\mathrm{atm}]{\text{i) HI},\ \Delta} \mathbf{P} \xrightarrow[\text{UV}]{\ce{Cl2}\ \text{(excess)}} \mathbf{Q}$$

A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is

Treatment of D-glucose with aqueous NaOH results in a mixture of monosaccharides, which are

A polysaccharide 'X' on boiling with dil $\mathrm{H_2SO_4}$ at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with bromine water gives gluconic acid. 'X' contains $\beta$-glycosidic linkages only. Compound 'X' is :

Match List I with List II.

Choose the most appropriate answer from the options given below:

L-isomer of a compound 'A' ($\mathrm{C_4H_8O_4}$) gives a positive test with $\mathrm{[Ag(NH_3)_2]^+}$. Treatment of 'A' with acetic anhydride yields triacetate derivative. Compound 'A' produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and $\mathrm{HNO_3}$ respectively. Compound (A) is :

Given below are two statements.

Statement I: Maltose has two $\alpha$-D-glucose units linked at $C_1$ and $C_4$ and is a reducing sugar.

Statement II: Maltose has two monosaccharides: $\alpha$-D-glucose and $\beta$-D-glucose linked at $C_1$ and $C_6$ and it is a non-reducing sugar.

In the light of the above statements, choose the correct answer from the options given below.

When sugar 'X' is boiled with dilute $\mathrm{H_2SO_4}$ in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with $\mathrm{HNO_3}$ yields saccharic acid where as 'B' is laevorotatory. The compound 'X' is :

Glycosidic linkage between C1 of $\alpha$-glucose and C2 of $\beta$-fructose is found in

Which one of the following is a reducing sugar ?