JEE Questions for Chemistry Biomolecules Quiz 1 - MCQExams.com

α-maltose consists of
  • one α-D-glucopyranose unit and one β-D- glucopyranose unit with 1-2 glyosidic linkage
  • two α-D-glucopyranose units with 1-2 glycosidic linkage
  • two β-D-glucopyranose units with 1-4 glycosidic linkage
  • two α-D-glucopyranose units with 1-4 glycosidic linkage
Number of chiral carbon atoms in β-D-(+)- glucose is
  • five
  • six
  • three
  • four
Sucrose on hydrolysis gives
  • glucose and maltose
  • glucose and lactose
  • glucose and fructose
  • only glucose
In aqueous solution glucose remains as
  • only in open chain form
  • only in pyranose form
  • only in furanose form
  • in all three forms in equilibrium
How can you say that glucose is cyclic compound?
  • Glucose undergoes Tollen's reaction
  • Glucose reacts with phenyl hydrazine
  • Glucose fails to react with sodium hydrogen sulphite
  • Glucose reacts with nitric acid
Which of the following pairs give positive Tollen's test?
  • Glucose, sucrose
  • Glucose, fructose
  • Hexanal, acetophenone
  • Fructose, sucrose
Which of the following compounds does not undergo mutarotation?
  • Glucose
  • Sucrose
  • Ribose
  • Fructose
If two isomers have been classified correctly as anomers, they may be also called
  • conformers
  • enantiomers
  • tautomers
  • diastereomers
The carbohydrate used as storage molecule in animal is
  • sucrose
  • glycogen
  • maltose
  • glucose
  • fructose
The monosaccharide constituents of lactose are
  • α-D-glucose and β-D-fructose
  • α-D-glucose
  • β-D-glucose
  • β-D-glucose and β-D-galactose
Synthesis of each molecule of glucose in photosynthesis involves
  • 18 molecules of ATP
  • 10 molecules of ATP
  • 8 molecules of ATP
  • 6 molecules of ATP
Glucose reacts with methyl alcohol to give
  • α-methyl glucoside
  • β-methyl glucoside
  • Both (and (
  • None of these
Which of the following is an aldohexose?
  • Cellulose
  • Sucrose
  • Glucose
  • Raffinose
Which of the following is an example of ketohexose?
  • Mannose
  • Galactose
  • Maltose
  • Fructose
Glucose and mannose are
  • epimers
  • anomers
  • ketohexoses
  • disaccharides
Polysaccharides have which of the following linkage?
  • Glycosidic linkage
  • H-bond
  • Peptide linkage
  • No linkage
The change in the optical rotation of freshly prepared solution of glucose is known as
  • tautomerism
  • racemisation
  • specific rotation
  • mutarotation
How glucose is related with fructose?
  • Functional group isomerism
  • Rotamers
  • Position isomerism
  • Geometrical isomerism
The sweetest carbohydrate is
  • sucrose
  • glucose
  • fructose
  • lactose
Which of the following compounds , when heated at 483 K turns to caramel?
  • Glucose
  • Sucrose
  • Fructose
  • Lactose
A carbohydrate is treated with α-naphthol and conc. H2SO4. What colour will be formed at the junction of two liquids?
  • Blood-red
  • Violet
  • Brown
  • Orange
α-D(+)-glucose and β-D-(+)-glucose are
  • conformers
  • epimers
  • anomers
  • enantiomers
A mixture of amylose and amylopectin is called
  • lactose
  • starch
  • cellulose
  • sucrose
Milk changes after digestion into
  • cellulose
  • fructose
  • glucose
  • lactose
Which of the following does not form an oxime?
  • Glucose
  • Glucose pentaacetate
  • Arabinose
  • Galactose
Glucose molecule reacts with 'X ' number of molecules of phenyl hydrazine to yield osazone. The value of 'X ' is
  • four
  • one
  • two
  • three
The anomeric carbon in D(+) glucose is
  • C-1 carbon
  • C-2 carbon
  • C-5 carbon
  • C-6 carbon
Cellulose is a polymer of
  • glucose
  • fructose
  • ribose
  • sucrose
Glucose gives silver mirror with ammoniacal silver nitrate because it has
  • aldehyde group
  • ester group
  • ketone group
  • alcoholic silver nitrate
Complete hydrolysis of cellulose gives
  • D-fructose
  • D-ribose
  • D-glucose
  • L-glucose
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