Please refer to Chapter 14 Biomolecules MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter Biomolecules and then attempt the following objective questions.

MCQ Questions Class 12 Chemistry Chapter 14 Biomolecules

Biomolecules MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The commonest disaccharide has the molecular formula
(a) C₁₀H₁₈O₉
(b) C₁₀H20O₁₀
(c) C₁₈H₂₂O₁₁
(d) C₁₂H₂₂O₁₁

Question. A carbohydrate that cannot be hydrolysed into simpler units is called
(a) polysaccharides
(b) trisaccharides
(c) disachharides
(d) monosaccharides

Question. Glucose can’t be classified as
(a) hexose
(b) carbohydrate
(c) aldose
(d) oligosaccharide

Question. The symbols D and L represents
(a) the optical activity of compounds.
(b) the relative configuration of a particular stereoisomer.
(c) the dextrorotatory nature of molecule.
(d) the levorotatory nature of molecule

Question. Which of the following properties of glucose cannot be explained by its open chain structure?
(i) Glucose does not form hydrogen sulphite with NaHSO₃
(ii) On oxidation with HNO₃ glucose gives saccharic acid.
(iii) Glucose is found to exist in two different crystalline forms which are named as α and β.
(a) (ii) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (ii)

Question. Monosaccharides usually contains … carbon atoms.
(a) C₃ to C₁₀
(b) C₁ to C₆
(c) C₄ to C₁₀
(d) C₅ to C₈

Question. Which of the following gives positive Fehling solution test ?
(a) Protein
(b) Sucrose
(c) Glucose
(d) Fats

Question. Which one of the following compounds is found abudnantly in nature?
(a) Fructose
(b) Starch
(c) Glucose
(d) Cellulose

Question. Which of the following statements is incorrect regarding glucose?
(a) It is an aldohexose.
(b) It is also known as dextrose
(c) It is monomer of cellulose.
(d) It is the least abundant organic compound on earth.

Question. The function of glucose is to
(a) provides energy
(b) promote growth
(c) prevent diseases
(d) perform all above

Question. Which of the following statements is incorrect ?
(a) Maltose gives two molecules of glucose only.
(b) Cellulose and sucrose are polysaccharide.
(c) Polysaccharides are not sweet in taste.
(d) Polysaccharides are also known as non-sugars.

Question. Glucose gives silver mirror test with Tollen’s reagent. It shows the presence of
(a) acidic group
(b) alcoholic group
(c) ketonic group
(d) aldehyde group

Question. Reducing sugars reduce.
(a) only Fehling’s solution
(b) only Tollen’s solution.
(c) both (a) & (b)
(d) neither (a) nor (b)

Question. Which among the following is the simplest sugar?
(a) Glucose
(b) Starch
(c) Cellulose
(d) None of these

Question. Which one of the following compounds is different from the rest?
(a) Sucrose
(b) Maltose
(c) Lactose
(d) Glucose

Question. Glucose reacts with acetic anhydride to form
(a) monoacetate
(b) tetra-acetate
(c) penta-acetate
(d) hexa-acetate

Question. Which is the least stable form of glucose ?
(a) α-D-Glucose
(b) β-D-Glucose
(c) Open chain structure
(d) All are equally stable

Question. Biomolecules are
(a) aldehydes and ketones
(b) acids and esters
(c) carbohydrates, proteins and fats
(d) alcohols and phenols

Question. Reduction of glucose by HI suggest that
(a) presence of OH groups
(b) presence of –CHO group
(c) cyclic structure of glucose
(d) six carbon atoms are arranged in straight chain

Question. Which of the following is a disaccharide ?
(a) Lactose
(b) Starch
(c) Cellulose
(d) Fructose

Question. The two functional groups present in a typical carbohydrate are:
(a) – CHO and – COOH
(b) > C = O and – OH
(c) – OH and – CHO
(d) – OH and – COOH

Question. When glucose reacts with bromine water, the main product is
(a) gluconic acid
(b) glyceraldehyde
(c) saccharic acid
(d) acetic acid

Question. Which one is a disaccharide ?
(a) Glucose
(b) Fructose
(c) Xylose
(d) Sucrose

Question. A carbohydrate insoluble in water is
(a) glucose
(b) fructose
(c) cellulose
(d) sucrose

Question. Glucose does not react with
(a) Br₂/H₂O
(b) H₂NOH
(c) HI
(d) NaHSO₃

Question. Which of the following monosaccharide is pentose ?
(a) Glucose
(b) Fructose
(c) Arabinose
(d) Galactose

Question. The sugar that is characteristic of milk is
(a) maltose
(b) ribose
(c) lactose
(d) galactose

Question. The reaction of glucose with red P + HI is called
(a) Sandmeyer’s reaction
(b) Reformatsky reaction
(c) Gattermann’s reaction
(d) Reduction

Question. A solution of D-glucose in water rotates the plane polarised light
(a) to the right
(b) to the left
(c) to either side
(d) None of these

Question. Cellulose is a polymer of
(a) Glucose
(b) Fructose
(c) Ribose
(d) Sucrose

Question. The number of chiral carbon atoms present in cyclic structure α-D(+) glucose
(a) 3
(b) 4
(c) 5
(d) 6

Question. The sugar present in fruits is
(a) fructose
(b) glucose
(c) sucrose
(d) galactose

Question. Carbohydrates are stored in the body as
(a) sugars
(b) starch
(c) glucose
(d) glycogen

Question. The α-D glucose and β-D glucose differ from each other due to difference in carbon atom with respect to its
(a) conformation
(b) configuration
(c) number of OH groups
(d) size of hemiacetal ring

Question. Maltose and glucose are
(a) oxidising sugar
(b) reducing sugar
(c) first is oxidising and second is reducing sugar
(d) both are non-reducing sugar

Question. Choose the correct relationship for glucose and fructose
(a) these are functional isomers
(b) these are chain isomers
(c) these are position isomers
(d) All of these

Question. Which of the following is the sweetest sugar?
(a) Sucrose
(b) Glucose
(c) Fructose
(d) Maltose

Question. Sucrose on hydrolysis gives
(a) fructose+ribose
(b) glucose + fructose
(c) glucose+glucose
(d) fructose + fructose

Question. The letter D and L in carbohydrates represent
(a) its optical rotation
(b) its mutarotation
(c) its direct synthesis
(d) its configuration

Question. Which of the following reactions of glucose can be explained only by its cyclic structure?
(a) Glucose forms pentaacetate
(b) Glucose reacts with hydroxylamine to form an oxime
(c) Pentaacetate of glucose does not react with hydroxylamine
(d) Glucose is oxidised by nitric acid to gluconic acid

Question. Isomerization of glucose produces
(a) galactose
(b) fructose
(c) mannose
(d) allose

Question. The pair of compounds in which both the compounds give positive test with Tollen’s reagent is
(a) Glucose and Sucrose
(b) Fructose and Sucrose
(c) Acetophenone and Hexanal
(d) Glucose and Fructose

Question. The two forms of D−glucopyranose obtained from the solution of D−glucose are called
(a) isomers
(b) anomers
(c) epimers
(d) enantiomers

Question. Which of the following reagent cannot distinguish between glucose and fructose?
(a) Fehling’s solution
(b) Tollen’s reagent
(c) Benedict’s solution
(d) All of these

Question. Which of the following statement is correct about fructose?
(a) It is dextrorotatory compound
(b) It exists in the two cyclic forms which is obtained by the addition of OH at C-5 to the >C=O group
(c) It exists as six membered ring
(d) It is named as furanose as it contain one oxygen and six carbon atom

Question. The sugar present in honey is
(a) sucrose
(b) glucose
(c) fructose
(d) maltose

Question. The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA?
(a) 1^st
(b) 2^nd
(c) 3^rd
(d) 4^th

Question. Fructose is
(a) a hemiacetal
(b) an acetal
(c) a hemiketal
(d) a ketal

Question. Which of the following carbohydrate does not correspond to the general formula C_x(H₂O)_y ?
(a) Glucose
(b) 2-Deoxyribose
(c) Fructose
(d) Arabinose

Question. In aqueous solution, an amino acid exists as
(a) cation
(b) anion
(c) dianion
(d) zwitter ion

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