324553
Which of the following will not show mutarotation?
1 Sucrose
2 Lactose
3 Maltose
4 Glucose
Explanation:
Sucrose does not exhibit mutarotation because the glycosidic bond is between the anomeric carbon of glucose and anomeric carbon of fructose. Hence hemiacetal is not present in sucrose, while it is there in lactose, maltose and glucose.
JEE - 2013
CHXII14:BIOMOLECULES
324554
During curdling of milk, what happens to sugar present in it?
1 Sugar is completely dissolved during this process
2 There is the formation of lactic acid in the above process
3 Sugar is partly dissolved during the curdling of milk
4 There is the formation of maltose in this process
Explanation:
Curdling of milk is caused due to the formation of lactic acid by the bacteria present in milk.
CHXII14:BIOMOLECULES
324555
Read the Assertion and Reason carefully and mark the correct option. Assertion : Ketoses give Seliwanoff's test faster than aldoses. Reason : Ketoses undergo \(\beta\)-elimination followed by formation of furfural.
1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
The reagent of Seliwanoff's test consists of resorcinol and concentrated HCl . Ketoses are more rapidly dehydrated than aldoses.Ketoses undergo dehydration in the presence of concentrated acid to yield 5-hydroxymethyl furfural. The dehydrated ketose reacts with two equivalents of resorcinol in a series of condensation reactions to produce a complex (not a precipitate), termed xanthenoid, with deep cherry red colour. Aldoses may react slightly to produce a faint pink to cherry red colour if the test is prolonged. Thus , both assertion and reason are correct and reason is the correct explanation of the assertion.
JEE - 2023
CHXII14:BIOMOLECULES
324556
Identify the glycosidic linkage present in lactose.
324553
Which of the following will not show mutarotation?
1 Sucrose
2 Lactose
3 Maltose
4 Glucose
Explanation:
Sucrose does not exhibit mutarotation because the glycosidic bond is between the anomeric carbon of glucose and anomeric carbon of fructose. Hence hemiacetal is not present in sucrose, while it is there in lactose, maltose and glucose.
JEE - 2013
CHXII14:BIOMOLECULES
324554
During curdling of milk, what happens to sugar present in it?
1 Sugar is completely dissolved during this process
2 There is the formation of lactic acid in the above process
3 Sugar is partly dissolved during the curdling of milk
4 There is the formation of maltose in this process
Explanation:
Curdling of milk is caused due to the formation of lactic acid by the bacteria present in milk.
CHXII14:BIOMOLECULES
324555
Read the Assertion and Reason carefully and mark the correct option. Assertion : Ketoses give Seliwanoff's test faster than aldoses. Reason : Ketoses undergo \(\beta\)-elimination followed by formation of furfural.
1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
The reagent of Seliwanoff's test consists of resorcinol and concentrated HCl . Ketoses are more rapidly dehydrated than aldoses.Ketoses undergo dehydration in the presence of concentrated acid to yield 5-hydroxymethyl furfural. The dehydrated ketose reacts with two equivalents of resorcinol in a series of condensation reactions to produce a complex (not a precipitate), termed xanthenoid, with deep cherry red colour. Aldoses may react slightly to produce a faint pink to cherry red colour if the test is prolonged. Thus , both assertion and reason are correct and reason is the correct explanation of the assertion.
JEE - 2023
CHXII14:BIOMOLECULES
324556
Identify the glycosidic linkage present in lactose.
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CHXII14:BIOMOLECULES
324553
Which of the following will not show mutarotation?
1 Sucrose
2 Lactose
3 Maltose
4 Glucose
Explanation:
Sucrose does not exhibit mutarotation because the glycosidic bond is between the anomeric carbon of glucose and anomeric carbon of fructose. Hence hemiacetal is not present in sucrose, while it is there in lactose, maltose and glucose.
JEE - 2013
CHXII14:BIOMOLECULES
324554
During curdling of milk, what happens to sugar present in it?
1 Sugar is completely dissolved during this process
2 There is the formation of lactic acid in the above process
3 Sugar is partly dissolved during the curdling of milk
4 There is the formation of maltose in this process
Explanation:
Curdling of milk is caused due to the formation of lactic acid by the bacteria present in milk.
CHXII14:BIOMOLECULES
324555
Read the Assertion and Reason carefully and mark the correct option. Assertion : Ketoses give Seliwanoff's test faster than aldoses. Reason : Ketoses undergo \(\beta\)-elimination followed by formation of furfural.
1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
The reagent of Seliwanoff's test consists of resorcinol and concentrated HCl . Ketoses are more rapidly dehydrated than aldoses.Ketoses undergo dehydration in the presence of concentrated acid to yield 5-hydroxymethyl furfural. The dehydrated ketose reacts with two equivalents of resorcinol in a series of condensation reactions to produce a complex (not a precipitate), termed xanthenoid, with deep cherry red colour. Aldoses may react slightly to produce a faint pink to cherry red colour if the test is prolonged. Thus , both assertion and reason are correct and reason is the correct explanation of the assertion.
JEE - 2023
CHXII14:BIOMOLECULES
324556
Identify the glycosidic linkage present in lactose.
324553
Which of the following will not show mutarotation?
1 Sucrose
2 Lactose
3 Maltose
4 Glucose
Explanation:
Sucrose does not exhibit mutarotation because the glycosidic bond is between the anomeric carbon of glucose and anomeric carbon of fructose. Hence hemiacetal is not present in sucrose, while it is there in lactose, maltose and glucose.
JEE - 2013
CHXII14:BIOMOLECULES
324554
During curdling of milk, what happens to sugar present in it?
1 Sugar is completely dissolved during this process
2 There is the formation of lactic acid in the above process
3 Sugar is partly dissolved during the curdling of milk
4 There is the formation of maltose in this process
Explanation:
Curdling of milk is caused due to the formation of lactic acid by the bacteria present in milk.
CHXII14:BIOMOLECULES
324555
Read the Assertion and Reason carefully and mark the correct option. Assertion : Ketoses give Seliwanoff's test faster than aldoses. Reason : Ketoses undergo \(\beta\)-elimination followed by formation of furfural.
1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
The reagent of Seliwanoff's test consists of resorcinol and concentrated HCl . Ketoses are more rapidly dehydrated than aldoses.Ketoses undergo dehydration in the presence of concentrated acid to yield 5-hydroxymethyl furfural. The dehydrated ketose reacts with two equivalents of resorcinol in a series of condensation reactions to produce a complex (not a precipitate), termed xanthenoid, with deep cherry red colour. Aldoses may react slightly to produce a faint pink to cherry red colour if the test is prolonged. Thus , both assertion and reason are correct and reason is the correct explanation of the assertion.
JEE - 2023
CHXII14:BIOMOLECULES
324556
Identify the glycosidic linkage present in lactose.
324553
Which of the following will not show mutarotation?
1 Sucrose
2 Lactose
3 Maltose
4 Glucose
Explanation:
Sucrose does not exhibit mutarotation because the glycosidic bond is between the anomeric carbon of glucose and anomeric carbon of fructose. Hence hemiacetal is not present in sucrose, while it is there in lactose, maltose and glucose.
JEE - 2013
CHXII14:BIOMOLECULES
324554
During curdling of milk, what happens to sugar present in it?
1 Sugar is completely dissolved during this process
2 There is the formation of lactic acid in the above process
3 Sugar is partly dissolved during the curdling of milk
4 There is the formation of maltose in this process
Explanation:
Curdling of milk is caused due to the formation of lactic acid by the bacteria present in milk.
CHXII14:BIOMOLECULES
324555
Read the Assertion and Reason carefully and mark the correct option. Assertion : Ketoses give Seliwanoff's test faster than aldoses. Reason : Ketoses undergo \(\beta\)-elimination followed by formation of furfural.
1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Assertion is true but Reason is false.
4 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
The reagent of Seliwanoff's test consists of resorcinol and concentrated HCl . Ketoses are more rapidly dehydrated than aldoses.Ketoses undergo dehydration in the presence of concentrated acid to yield 5-hydroxymethyl furfural. The dehydrated ketose reacts with two equivalents of resorcinol in a series of condensation reactions to produce a complex (not a precipitate), termed xanthenoid, with deep cherry red colour. Aldoses may react slightly to produce a faint pink to cherry red colour if the test is prolonged. Thus , both assertion and reason are correct and reason is the correct explanation of the assertion.
JEE - 2023
CHXII14:BIOMOLECULES
324556
Identify the glycosidic linkage present in lactose.
