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Common Monosaccharides

Why are gluco...

Question

Why are glucose, fructose and galactose known as isomers?

A

They all have the same optical property

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B

They have the same structural and chemical formula

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C

They vary in the arrangement of asymmetric carbons

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D

They have the same chemical formula, but vary in the arrangement of atoms in the molecule

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Solution

The correct option is D
They have the same chemical formula, but vary in the arrangement of atoms in the molecule

Glucose, fructose and galactose are known as isomers because they have the same chemical formula and they basically vary only in the arrangement of atoms in the molecule.

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Why are glucose, fructose and galactose known as isomers?

Q. What type of isomers are glucose and fructose?

Statement 1: Instead of glucose, other forms of sugar like fructose or galactose can also be used to obtain energy during respiration.

Statement 2: Fructose and galactose have the same chemical formula of C6H12O6 as that of glucose.

Choose the correct combinations of the monosaccharides forming disaccharides.

i. Glucose + Glucose = Maltose ii. Glucose + Fructose = Lactose

iii. Glucose + Fructose = Sucrose iv. Glucose + Galactose = Lactose

$G l u c o s e$ $+ C H_{3} O H H C l (g) \to$	(1)Mannose
$S u c r o s e$ $+ H_{3} O^{+} \to$	(2) Galactose
$F r u c t o s e$ $B a s e \to$	(3) Glucose
$L a c t o s e$ $+ H_{3} O^{+} \to$	(4) Fructose
	(5) Glucoside

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Common Monosaccharides

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