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Test: Carbohydrates - NEET MCQ


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20 Questions MCQ Test Chemistry Class 12 - Test: Carbohydrates

Test: Carbohydrates for NEET 2024 is part of Chemistry Class 12 preparation. The Test: Carbohydrates questions and answers have been prepared according to the NEET exam syllabus.The Test: Carbohydrates MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Carbohydrates below.
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Test: Carbohydrates - Question 1

On hydrolysis maltose gives:

Detailed Solution for Test: Carbohydrates - Question 1

Maltose can be produced from starch by hydrolysis in the presence of the enzyme diastase. It can be broken down into two glucose molecules by hydrolysis. In living organisms, the enzyme maltase can achieve this very rapidly. In the laboratory, heating with a strong acid for several minutes will produce the same result.

Test: Carbohydrates - Question 2

The commonest disaccharide have the molecular formula:​

Detailed Solution for Test: Carbohydrates - Question 2

Sucrose or cane sugar is the commonest of the disaccharides. It has the molecular formula C12H22O11. It does not form a phenylhydrazone or exhibit carbonyl properties. On hydrolysis with dilute acids, it yields one molecule of D-(+)-glucose and one molecule of D-(—)-fructose. It is not a reducing sugar. 

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Test: Carbohydrates - Question 3

Glucose and fructose are:

Detailed Solution for Test: Carbohydrates - Question 3

Glucose and fructose are functional isomers of each other Because they have same molecular formula that is C6H12O6 But different functional group in their chemical formula. Glucose has aldehyde group while fructose has ketone as functional group.

Test: Carbohydrates - Question 4

Which of the following carbohydrates is called milk sugar?

Detailed Solution for Test: Carbohydrates - Question 4

Lactose: The sugar found naturally in milk, it is a disaccharide composed of one galactose unit and one glucose unit; sometimes called milk sugar.

Test: Carbohydrates - Question 5

The following is a reaction of glucose with Fehling’s reagent. What will happen in the reaction?

Detailed Solution for Test: Carbohydrates - Question 5

Because it is the chemical property of aliphatic aldehyde to give red precipitate with fehling solution.

RCHO + 2 CuO -----------> Cu2O. + RCOOH

Fehling reagents is aq. alkaline CuSO4 solution along with Rochelle salt Na-K tartrate.
And glucose molecule consists of aldehydic group at first position and hence it is also a aldehyde and thus give this characteristic test.

Test: Carbohydrates - Question 6

The oxide linkage formed by the loss of a water molecule when two monosaccharides are joined together through oxygen atom is called:

Detailed Solution for Test: Carbohydrates - Question 6

Fructose is an important ketohexose. It is obtained along with glucose by the hydrolysis of disaccharide, sucrose. The two monosaccharides are joined together by an oxide linkage formed by the loss of a water molecule. Such a linkage between two monosaccharide units through oxygen atom is called Glycosidic Linkage.

Test: Carbohydrates - Question 7

Glucose + Tollen’s reagent → Silver mirror. The process shows:

Detailed Solution for Test: Carbohydrates - Question 7

Glucose gives silver mirror test with Tollens reagent. It shows the presence of aldehyde group.
Also, mild oxidation of glucose with bromine water gives gluconic acid which shows the presence of aldehyde group.

Test: Carbohydrates - Question 8

Identify the following compound:

 

Test: Carbohydrates - Question 9

The compound which gives red colour with Fehling’s solution?

Detailed Solution for Test: Carbohydrates - Question 9

Fehling's solution to make difference between carbohydrate and ketone functional grp and also used for differentiate reducing and non reducing sugar and as u know glucose is a reducing sugar so it will give red colour with fehling's solution (all monosachharides are reducing sugar).

Test: Carbohydrates - Question 10

In polysaccharides, the linkage connecting monosaccharides is called:

Detailed Solution for Test: Carbohydrates - Question 10
  • Disaccharides on hydrolysis with dilute acids or enzymes yield two molecules of either the same or different monosaccharides.
  • The two monosaccharides are joined together by an oxide linkage formed by the loss of a water molecule. Such a linkage between two monosaccharide units through oxygen atom is called glycosidic linkage.
Test: Carbohydrates - Question 11

Glucose reacts with acetic anhydride to form:

Detailed Solution for Test: Carbohydrates - Question 11

It forms glucose pentaacetate. The acetic anhydride esterifies with all the alcohol groups on the glucose ring.

Test: Carbohydrates - Question 12

What does the following reaction of glucose with HI elucidates about the structure of glucose?

Detailed Solution for Test: Carbohydrates - Question 12

Reaction of glucose with HI forms hexane. This reaction shows the presence of six carbons linked linearly in glucose.

Test: Carbohydrates - Question 13

The Molisch test is a chemical test that determines the presence of:

Detailed Solution for Test: Carbohydrates - Question 13

The Molisch test uses concentrated sulphuric acid as the dehydrating acid. This acid dehydrates all carbohydrates, so the test is used to distinguish between carbohydrates and non-carbohydrates. 

Test: Carbohydrates - Question 14

What does the following reaction shows about the structure of glucose?

Detailed Solution for Test: Carbohydrates - Question 14

The correct answer is Option A.
 
Glucose gets oxidized to cyanohydrin in reaction with HCN . This indicates that the carbonyl group is present as an aldehydic group.

Test: Carbohydrates - Question 15

Which among the following is a non-reducing sugar?

Detailed Solution for Test: Carbohydrates - Question 15

Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds. All monosaccharides such as glucose are reducing sugars. A disaccharide can be a reducing sugar or a non-reducing sugar. Maltose and lactose are reducing sugars, while sucrose is a non-reducing sugar.

Test: Carbohydrates - Question 16

Which of the following carbohydrates is called an invert sugar?

Detailed Solution for Test: Carbohydrates - Question 16

It is called invert sugar because the angle of the specific rotation of the plain polarized light changes from a positive to a negative value due to the presence of the optical isomers of the mixture of glucose and fructosesugars.

Test: Carbohydrates - Question 17

What is the relation between the following pairs of monosaccharides?

Detailed Solution for Test: Carbohydrates - Question 17

The pairs of optical isomers which differ in configuration around any other C atom other than Catom are called epimers. D-glucose and D-mannose are C2 epimers.

 

Test: Carbohydrates - Question 18

Hydrolysis of sucrose is called:

Detailed Solution for Test: Carbohydrates - Question 18

 

Hydrolysis of sucrose to give glucose and fructose is called inversion. hydrolysis of sucrose brings about a change in the sign of rotation, from dextro (+) to laevo (–) and the product is named as invert sugar.

Test: Carbohydrates - Question 19

Which of the following carbohydrate is an example of an oligosaccharide?

Detailed Solution for Test: Carbohydrates - Question 19

Lactose intolerance is the inability to break down a type of natural sugar called lactose. Lactose is commonly found in dairy products, such as milk and yogurt. A person becomes lactose intolerant when his or her small intestine stops making enough of the enzyme lactase to digest and break down the lactose.

Test: Carbohydrates - Question 20

Sucrose is a non-reducing sugar because:​

Detailed Solution for Test: Carbohydrates - Question 20

Sucrose is a non-reducing sugar because the two monosaccharide units are held together by a glycosidic linkage between C1 of α-glucose and C2 of β-fructose. Since the reducing groups of glucose and fructose are involved in glycosidic bond formation, sucrose is a non-reducing sugar.

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