Disaccharide

Q. Maltose consists of:

1. $\beta -$ glucose and $\beta -$ galactose
2. $\alpha -$glucose and $\alpha -$fructose
3. $\alpha -$sucrose and $\beta -$glucose
4. $\alpha -$glucose and $\alpha -$glucose

Q. calculate the percentage hydrolysis of NaOCN in its 0.003M aqueous solution (Ka for HOCN =3.33*10^-4M)

Q.

Regarding lactose, some statements are given below

A) On hydrolysis, lactose gives β-D-galactose and β-D-glucose

B) In lactose C₁ of β-D-galactose has acetal structure and C₁ of β-D-glucose has hemiacetal structure

C) In lactose molecule, β-D-galactose is a non-reducing unit and β-D-glucose is reducing unit

The correct statements are

1. A, C

2. A, B

3. B, C

4. Only A

Q.

Correct statements among the following is / are

A.D - Glucose and L - glucose are enantiomers

B.α- D - Glucose and β- D - Glucose are anomers

C.Glucose and fructose are functional group isomers

D.D - glucose has 2R, 3R, 4S, 5R configuration

1. A & B

2. A, B, C
3. A, C, D
4. A, B, C, D

Q. why is the reaction 2kclo3​ >2kcl+3 o2 irreversible?

Q.

$Glucose\stackrel{A{g}_{2}O}{\to }X$

$Glucose\stackrel{Conc.HN{O}_3}{\to }Y$

X. Y and X respectively are:

1. HOOC - (CHOH)₄ - CH₂OH, HOOC - (CHOH)₄ - CHO

2. HOOC - (CHOH)₄ - COOH, HOOC - (CHOH)₄ - CH₂OH

3. HOOC - (CHOH)₄ - CHO, HOOC - (CHOH)₄ - COOH

4. HOOC - (CHOH)₄ - CH₂OH, HOOC - (CHOH)₄ - COOH