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Structure of Glucose

Three structu...

Question

Three structures are given below in which two glucose units are linked.
Which of these linkages between glucose units are between $C_{1} a n d C_{4}$ and which linkages are between $C_{1} a n d C_{6} ?$

(a) (i) is between C1 and C4, (ii) and (iii) are between C1 and C6
(b) (i) and (ii) are between C1 and C4, (iii) is between C1 and C6
(c) (i) and (iii) are between C1 and C4 (ii) is between C1 and C6
(d) (i) and (iii) are between C1 and C6, (ii) is between $C_{1} a n d C_{4}$

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Solution

Answer: (c) (i) and (iii) are between C1 and C4 (ii) is between C1 and C6

The numbering of glucose starts from the adjacent carbon of O- atom to the other carbon atom ending at last $C H_{2} O H$ group as shown below

In this way, numbers for the disaccharides can be done as

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Match the List-I and List-II:

List I (Saccharides)	List II (Formed by)
(A) Sucrose	(i) $β$ -D glucose $C_{1} - C_{4}$ glycosidic linkage
(B) Lactose	(ii) $α$ -D glucose, $β$ -D fructose $C_{1} - C_{2}$ glycosidic linkage
(C) Cellulose	(iii) $β$ -D glucose, $β$ -D galactose $C_{1} - C_{4}$ glycosidic linkage

Q. In the ambiguous case, if b and A are given and

c_{1}, c_{2}

are the two values of
third side, prove that
(i)

c_{1} + c_{2} = 2 b cos A

c_{1} c_{2} = b^{2} - a^{2}

c_{1}^{2} - 2 c_{1} c_{2} cos 2 A + c_{2}^{2} = 4 a^{2} {cos}^{2} A .

(c_{1} - c_{2})^{2} + (c_{1} + c_{2})^{2} {tan}^{2} A = 4 a^{2}

Q. Four capacitors,

C_{1}, C_{2}, C_{3}

C_{4}

are connected as shown in figure below. Calculate equivalent capacitance of the circuit between points X and Y.

Q. Three structures are given below in which two glucose units are linked. Which of these linkages between glucose units are between

C - 1

C - 4

and which linkages are between

C - 1

C - 6

The effective capacitance between P and Q of the figure below is :

$C_{1} = C_{3} = C_{4} = C_{5} = 10 μ F$

$C_{2} = 100 μ F$

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Structure of Glucose

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