287075
The reagents with which glucose does NOT react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D. \(\mathrm{NH}_{2} \mathrm{OH}\)
E. \(\mathrm{NaHSO}_{3}\)
Choose the correct options from the given below:
1 B and C
2 A and D
3 B and E
4 E and D
Explanation:
(c) Glucose does not give Schiff's test and it does not form the hydrogen sulphite addition product with \(\mathrm{NaHSO}_{3}\) due to its cyclic structure (absence of free-CHO grop).
Glucose does reacts with \(\mathrm{NH}_{2} \mathrm{OH}\) but its pentaacetate does not react with \(\mathrm{NH}_{2} \mathrm{OH}\) due to absence of free - CHO group.
NCERT| Page-N-284| 2024
BIOMOLECULES (NEET PYQS)
287076
The reaction of concentrated sulphuric acid with carbohydrates \(\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)\) is an example of
1 Sulphonation
2 Dehydration
3 Oxidation
4 Reduction
Explanation:
(b) Conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is a strong dehydrating agents and it readily dehydrates carbohydrates into carbon (black residue) or charred sugar.
\(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) or \(\mathrm{C}_{12}\left(\mathrm{H}_{2} \mathrm{O}\right)_{11} \xrightarrow[-11 \mathrm{H}_{2} \mathrm{O}]{\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}} \underset{\text { (Black) }}{12 \mathrm{C}}\)
NEET Ph-II 2020
BIOMOLECULES (NEET PYQS)
287077
Sucrose on hydrolysis gives:
1 \(\alpha\)-D-Glucose \(+\beta\)-D-Glucose
2 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
3 \(\alpha\)-D-Fructose \(+\beta\)-D-Fructose
4 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
Explanation:
(b) Sucrose \(\xrightarrow{\text { Hydrolysis }} \alpha\)-D-Glucose
\(+\beta\)-D-Fructose
**NOTE** Sucrose on hydrolysis brings about a change in the sign of rotation from dextro to laevo and the product is called as invert sugar.
NCERT| Page-417/N-287| 2020
BIOMOLECULES (NEET PYQS)
287078
Which one given below is a non-reducing sugar?
1 Maltose
2 Lactose
3 Glucose
4 Sucrose
Explanation:
(d) Sucrose is non-reducing disaccharide as the two monosaccharide units are linked through their respective carbonyl groups.
NOTES Only carbonyl group can be reduced as with other carbons, -OH group is attached.
NCERT | Page-417 / N-287| 2016
BIOMOLECULES (NEET PYQS)
287079
\(\quad \mathrm{D}(+)\) glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be : \(\quad\)
1
2
3
4
Explanation:
(d) Glucose reacts with hydroxyl amine to form an oxime.
287075
The reagents with which glucose does NOT react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D. \(\mathrm{NH}_{2} \mathrm{OH}\)
E. \(\mathrm{NaHSO}_{3}\)
Choose the correct options from the given below:
1 B and C
2 A and D
3 B and E
4 E and D
Explanation:
(c) Glucose does not give Schiff's test and it does not form the hydrogen sulphite addition product with \(\mathrm{NaHSO}_{3}\) due to its cyclic structure (absence of free-CHO grop).
Glucose does reacts with \(\mathrm{NH}_{2} \mathrm{OH}\) but its pentaacetate does not react with \(\mathrm{NH}_{2} \mathrm{OH}\) due to absence of free - CHO group.
NCERT| Page-N-284| 2024
BIOMOLECULES (NEET PYQS)
287076
The reaction of concentrated sulphuric acid with carbohydrates \(\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)\) is an example of
1 Sulphonation
2 Dehydration
3 Oxidation
4 Reduction
Explanation:
(b) Conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is a strong dehydrating agents and it readily dehydrates carbohydrates into carbon (black residue) or charred sugar.
\(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) or \(\mathrm{C}_{12}\left(\mathrm{H}_{2} \mathrm{O}\right)_{11} \xrightarrow[-11 \mathrm{H}_{2} \mathrm{O}]{\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}} \underset{\text { (Black) }}{12 \mathrm{C}}\)
NEET Ph-II 2020
BIOMOLECULES (NEET PYQS)
287077
Sucrose on hydrolysis gives:
1 \(\alpha\)-D-Glucose \(+\beta\)-D-Glucose
2 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
3 \(\alpha\)-D-Fructose \(+\beta\)-D-Fructose
4 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
Explanation:
(b) Sucrose \(\xrightarrow{\text { Hydrolysis }} \alpha\)-D-Glucose
\(+\beta\)-D-Fructose
**NOTE** Sucrose on hydrolysis brings about a change in the sign of rotation from dextro to laevo and the product is called as invert sugar.
NCERT| Page-417/N-287| 2020
BIOMOLECULES (NEET PYQS)
287078
Which one given below is a non-reducing sugar?
1 Maltose
2 Lactose
3 Glucose
4 Sucrose
Explanation:
(d) Sucrose is non-reducing disaccharide as the two monosaccharide units are linked through their respective carbonyl groups.
NOTES Only carbonyl group can be reduced as with other carbons, -OH group is attached.
NCERT | Page-417 / N-287| 2016
BIOMOLECULES (NEET PYQS)
287079
\(\quad \mathrm{D}(+)\) glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be : \(\quad\)
1
2
3
4
Explanation:
(d) Glucose reacts with hydroxyl amine to form an oxime.
287075
The reagents with which glucose does NOT react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D. \(\mathrm{NH}_{2} \mathrm{OH}\)
E. \(\mathrm{NaHSO}_{3}\)
Choose the correct options from the given below:
1 B and C
2 A and D
3 B and E
4 E and D
Explanation:
(c) Glucose does not give Schiff's test and it does not form the hydrogen sulphite addition product with \(\mathrm{NaHSO}_{3}\) due to its cyclic structure (absence of free-CHO grop).
Glucose does reacts with \(\mathrm{NH}_{2} \mathrm{OH}\) but its pentaacetate does not react with \(\mathrm{NH}_{2} \mathrm{OH}\) due to absence of free - CHO group.
NCERT| Page-N-284| 2024
BIOMOLECULES (NEET PYQS)
287076
The reaction of concentrated sulphuric acid with carbohydrates \(\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)\) is an example of
1 Sulphonation
2 Dehydration
3 Oxidation
4 Reduction
Explanation:
(b) Conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is a strong dehydrating agents and it readily dehydrates carbohydrates into carbon (black residue) or charred sugar.
\(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) or \(\mathrm{C}_{12}\left(\mathrm{H}_{2} \mathrm{O}\right)_{11} \xrightarrow[-11 \mathrm{H}_{2} \mathrm{O}]{\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}} \underset{\text { (Black) }}{12 \mathrm{C}}\)
NEET Ph-II 2020
BIOMOLECULES (NEET PYQS)
287077
Sucrose on hydrolysis gives:
1 \(\alpha\)-D-Glucose \(+\beta\)-D-Glucose
2 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
3 \(\alpha\)-D-Fructose \(+\beta\)-D-Fructose
4 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
Explanation:
(b) Sucrose \(\xrightarrow{\text { Hydrolysis }} \alpha\)-D-Glucose
\(+\beta\)-D-Fructose
**NOTE** Sucrose on hydrolysis brings about a change in the sign of rotation from dextro to laevo and the product is called as invert sugar.
NCERT| Page-417/N-287| 2020
BIOMOLECULES (NEET PYQS)
287078
Which one given below is a non-reducing sugar?
1 Maltose
2 Lactose
3 Glucose
4 Sucrose
Explanation:
(d) Sucrose is non-reducing disaccharide as the two monosaccharide units are linked through their respective carbonyl groups.
NOTES Only carbonyl group can be reduced as with other carbons, -OH group is attached.
NCERT | Page-417 / N-287| 2016
BIOMOLECULES (NEET PYQS)
287079
\(\quad \mathrm{D}(+)\) glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be : \(\quad\)
1
2
3
4
Explanation:
(d) Glucose reacts with hydroxyl amine to form an oxime.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
BIOMOLECULES (NEET PYQS)
287075
The reagents with which glucose does NOT react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D. \(\mathrm{NH}_{2} \mathrm{OH}\)
E. \(\mathrm{NaHSO}_{3}\)
Choose the correct options from the given below:
1 B and C
2 A and D
3 B and E
4 E and D
Explanation:
(c) Glucose does not give Schiff's test and it does not form the hydrogen sulphite addition product with \(\mathrm{NaHSO}_{3}\) due to its cyclic structure (absence of free-CHO grop).
Glucose does reacts with \(\mathrm{NH}_{2} \mathrm{OH}\) but its pentaacetate does not react with \(\mathrm{NH}_{2} \mathrm{OH}\) due to absence of free - CHO group.
NCERT| Page-N-284| 2024
BIOMOLECULES (NEET PYQS)
287076
The reaction of concentrated sulphuric acid with carbohydrates \(\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)\) is an example of
1 Sulphonation
2 Dehydration
3 Oxidation
4 Reduction
Explanation:
(b) Conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is a strong dehydrating agents and it readily dehydrates carbohydrates into carbon (black residue) or charred sugar.
\(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) or \(\mathrm{C}_{12}\left(\mathrm{H}_{2} \mathrm{O}\right)_{11} \xrightarrow[-11 \mathrm{H}_{2} \mathrm{O}]{\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}} \underset{\text { (Black) }}{12 \mathrm{C}}\)
NEET Ph-II 2020
BIOMOLECULES (NEET PYQS)
287077
Sucrose on hydrolysis gives:
1 \(\alpha\)-D-Glucose \(+\beta\)-D-Glucose
2 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
3 \(\alpha\)-D-Fructose \(+\beta\)-D-Fructose
4 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
Explanation:
(b) Sucrose \(\xrightarrow{\text { Hydrolysis }} \alpha\)-D-Glucose
\(+\beta\)-D-Fructose
**NOTE** Sucrose on hydrolysis brings about a change in the sign of rotation from dextro to laevo and the product is called as invert sugar.
NCERT| Page-417/N-287| 2020
BIOMOLECULES (NEET PYQS)
287078
Which one given below is a non-reducing sugar?
1 Maltose
2 Lactose
3 Glucose
4 Sucrose
Explanation:
(d) Sucrose is non-reducing disaccharide as the two monosaccharide units are linked through their respective carbonyl groups.
NOTES Only carbonyl group can be reduced as with other carbons, -OH group is attached.
NCERT | Page-417 / N-287| 2016
BIOMOLECULES (NEET PYQS)
287079
\(\quad \mathrm{D}(+)\) glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be : \(\quad\)
1
2
3
4
Explanation:
(d) Glucose reacts with hydroxyl amine to form an oxime.
287075
The reagents with which glucose does NOT react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D. \(\mathrm{NH}_{2} \mathrm{OH}\)
E. \(\mathrm{NaHSO}_{3}\)
Choose the correct options from the given below:
1 B and C
2 A and D
3 B and E
4 E and D
Explanation:
(c) Glucose does not give Schiff's test and it does not form the hydrogen sulphite addition product with \(\mathrm{NaHSO}_{3}\) due to its cyclic structure (absence of free-CHO grop).
Glucose does reacts with \(\mathrm{NH}_{2} \mathrm{OH}\) but its pentaacetate does not react with \(\mathrm{NH}_{2} \mathrm{OH}\) due to absence of free - CHO group.
NCERT| Page-N-284| 2024
BIOMOLECULES (NEET PYQS)
287076
The reaction of concentrated sulphuric acid with carbohydrates \(\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)\) is an example of
1 Sulphonation
2 Dehydration
3 Oxidation
4 Reduction
Explanation:
(b) Conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) is a strong dehydrating agents and it readily dehydrates carbohydrates into carbon (black residue) or charred sugar.
\(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) or \(\mathrm{C}_{12}\left(\mathrm{H}_{2} \mathrm{O}\right)_{11} \xrightarrow[-11 \mathrm{H}_{2} \mathrm{O}]{\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}} \underset{\text { (Black) }}{12 \mathrm{C}}\)
NEET Ph-II 2020
BIOMOLECULES (NEET PYQS)
287077
Sucrose on hydrolysis gives:
1 \(\alpha\)-D-Glucose \(+\beta\)-D-Glucose
2 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
3 \(\alpha\)-D-Fructose \(+\beta\)-D-Fructose
4 \(\alpha\)-D-Glucose \(+\beta\)-D-Fructose
Explanation:
(b) Sucrose \(\xrightarrow{\text { Hydrolysis }} \alpha\)-D-Glucose
\(+\beta\)-D-Fructose
**NOTE** Sucrose on hydrolysis brings about a change in the sign of rotation from dextro to laevo and the product is called as invert sugar.
NCERT| Page-417/N-287| 2020
BIOMOLECULES (NEET PYQS)
287078
Which one given below is a non-reducing sugar?
1 Maltose
2 Lactose
3 Glucose
4 Sucrose
Explanation:
(d) Sucrose is non-reducing disaccharide as the two monosaccharide units are linked through their respective carbonyl groups.
NOTES Only carbonyl group can be reduced as with other carbons, -OH group is attached.
NCERT | Page-417 / N-287| 2016
BIOMOLECULES (NEET PYQS)
287079
\(\quad \mathrm{D}(+)\) glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be : \(\quad\)
1
2
3
4
Explanation:
(d) Glucose reacts with hydroxyl amine to form an oxime.
