Students of class 12 Chemistry should refer to MCQ Questions Class 12 Chemistry Biomolecules with answers provided here which is an important chapter in Class 12 Chemistry NCERT textbook. These MCQ for Class 12 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 12 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 12 Chemistry examination

Chapter 14 Biomolecules MCQ with Answers Class 12 Chemistry

MCQ Questions Class 12 Chemistry Biomolecules provided below have been prepared by expert teachers of grade 12. These objective questions with solutions are expected to come in the upcoming Standard 12 examinations. Learn the below provided MCQ questions to get better marks in examinations.

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

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

Question. Three cyclic structures of monosaccharides are given below which of these are anomers.

(a) I and II
(b) II and III
(c) I and III
(d) III is anomer of I and II

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

Question. Which of the following statements is not true about glucose? 
(a) It is an aldohexose.
(b) On heating with HI it forms n-hexane.
(c) It is present in furanose form.
(d) It does not give 2,4-DNP test.

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

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

Question. Optical rotations of some compounds along with their structures are given below which of them have
D configuration.

(a) I, II, III
(b) II, III
(c) I, II
(d) III

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. Which of the following reaction confirms the presence of carbonyl group (> C—O) in glucose?
(a) Reaction with HI
(b) Reaction with hydroxylamine
(c) Reaction with HCN
(d) Both (b) and (c)

Question. DNA and RNA contain four bases each. Which of the following bases is not present in RNA?
(a) Adenine
(b) Uracil
(c) Thymine
(d) Cytosine

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

Question. Fructose reduces Tollens’ reagent due to
(a) Primary alcoholic group
(b) Asymmetric carbons
(c) Secondary alcoholic groups
(d) Enolisation of fructose followed by conversion to aldehyde by base

Question. Carbohydrates are classified on the basis of their behaviour on hydrolysis and also as reducing or non-reducing sugar. Sucrose is a __________. 
(a) monosaccharide
(b) disaccharide
(c) reducing sugar
(d) non-reducing sugar

Question. Milk changes after digestion into 
(a) cellulose
(b) fructose
(c) glucose
(d) lactose   

Question. Which one of the following is an ester ? 
(a) Coconut o il
(b) Kerosene oil
(c) Soap
(d) Glycerine       

Question. Which of the following does not form an oxime?
(a) Glucose 
(b) Glucose pentaacetate
(c) Arabi nose
(d) Galactose     

Question. Vitamin B₆ is known as
(a) Pyridoxin
(b) Thiamine
(c) Tocopherol
(d) Riboflavin     

Question. Glucose molecule reacts with ‘X’ number of molecules of phenyl hydrazine to yield osazone. The value of ‘X’ is
(a) four
(b) one 
(c) two
(d) three     

Question. Which set of terms correctly identifies the carbohydrate shown?

I. Pentose
II. Hexose
III. Aldose
IV. Ketose
V. Pyranose
VI. Furanose
(a) I, III and VI
(b) I, III and V
(c) II, III and V
(d) II, III and VI
(e) l, IV and VI     

Question. Diabetes is detected, using . . . . . . for testing mine of patients. 
(a) Fehling’s solution
(b) Tollen’s reagent
(c) Benedict’s solution
(d) Baeyer’s reagent     

Question. The anomeric carbon in D(+) glucose is 
(a) C-1 carbon
(b) C-2 carbon
(c) C-5 carbon
(d) C-6 carbon   

Question. Glucose contains in addition to aldehyde group
(a) one secondary OH and four primary OH groups
(b) one primary OH and four secondary OH groups
(c) two primary OH and three secondary OH groups
(d) three primary OH and two secondary OH groups   

Question. Which of the following indicates open chain structure of glucose? 
(a) Pentaacetyl derivative of glucose
(b) Cyanohydrin formation with HCN
(c) Reaction with Fehling’s solution
(d) Reaction with Tollen’s reagent     

Question. Complete hydrolysis of cellulose gives
(a) D-fructose
(b) D-ribose
(c) D-glucose
(d) L-glucose       

Question. Which one of the following is an example of a non-reducing sugar? 
(a) Sucrose
(b) Lactose
(c) Maltose
(d) Cellobiose     

Question. Methyl α-D-glucoside and methyl- β-D-glucoside are
(a) epimers 
(b) anomers
(c) enantiomers
(d) conformational diastereomers     

Question. Iodine test is shown by
(a) glucose
(b) starch
(c) glycogen
(d) polypeptide       

Question. Raffinose is 
(a) trisaccharide
(b) disaccharide
(c) monosaccharide
(d) polysaccharide     

Question. Glucose is a/an 
(a) polyhydroxy ketone
(b) alcohol
(c) hydrate of carbon
(d) pentahydroxy aldehyde     

Question. All monosaccharides …… Tollen’s reagent.
(a) oxidises
(b) condense with
(c) reduces
(d) add to     

Question. Cellulose is a polymer of 
(a) glucose
(b) fructose
(c) ribose
(d) sucrose     

Question. Lactose gives on hydrolysis
(a) glucose
(b) glucose and galactose
(c) fructose
(d) glucose and fructose     

Question. Number of chiral carbon atoms in β-D-(+)- glucose is
(a) five
(b) six 
(c) three
(d) four       

Question. Sucrose on hydrolysis gives
(a) glucose and maltose
(b) glucose and lactose
(c) glucose and fructose
(d) only glucose     

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. Which of the following pairs represents anomers?

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. 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. Amylopectin is insoluble in water and constitutes about
(a) 15–20% of starch
(b) 20–40% of starch
(c) 50–70% of starch
(d) 80–85% of starch

Question. Cellulose is not digestible by human beings due to absence of cellulose hydrolysing enzyme called
(a) cellulase
(b) invertase
(c) zymase
(d) urease

Question. Glycogen is a branched chain polymer of α-D-glucose units in which chain is formed by C1—C4 glycosidic linkage whereas branching occurs by the formation of C1—C6 glycosidic linkage. Structure of glycogen is similar to __________. 
(a) Amylose
(b) Amylopectin
(c) Cellulose
(d) Glucose

Question. Which of the following polymer is stored in the liver of animals? 
(a) Amylose
(b) Cellulose
(c) Amylopectin
(d) Glycogen

Question. Which of the following naturally occurring a– aminoacids is optically inactive?
(a) Glycine
(b) Alanine
(c) Leucine
(d) Valine

Question. Each polypeptide in a protein has aminoacids linked with each other in a specific sequence. This sequence of amino acids is said to be __________.
(a) primary structure of proteins.
(b) secondary structure of proteins.
(c) tertiary structure of proteins.
(d) quaternary structure of proteins.

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. Proteins are found to have two different types of secondary structures viz. α-helix and β-pleated sheet structure. α-helix structure of protein is stabilised by : 
(a) Peptide bonds
(b) van der Waals forces
(c) Hydrogen bonds
(d) Dipole-dipole interactions

Question. Nucleic acids are the polymers of __________. 
(a) nucleosides
(b) nucleotides
(c) bases
(d) 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. 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. Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkages present? 
(a) 5′ and 3′
(b) 1′ and 5′
(c) 5′ and 5′
(d) 3′ and 3′

Question. Proteins can be classified into two types on the basis of their molecular shape i.e., fibrous proteins and globular proteins. Examples of globular proteins are : 
(a) Insulin
(b) Keratin
(c) Albumin
(d) Myosin

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

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 one of the following does not exhibit the phenomenon of mutarotation ?
(a) (+) – Sucrose
(b) (+) – Lactose
(c) (+) – Maltose
(d) (–) – Fructose

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

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 is the sweetest sugar?
(a) Sucrose
(b) Glucose
(c) Fructose
(d) Maltose

Question. Select the uses of carbohydrates.
(a) Honey is used as instant source of energy by vaids in ayurvedic system of medicine
(b) These are used as storage molecules
(c) They are used in furniture, cotton fibre, lacquers
(d) All of the above

Question. DNA multiplication is called as
(a) translation
(b) transduction
(c) transcription
(d) replication

Question. Chromosomes are made from
(a) proteins
(b) nucleic acids
(c) proteins and nucleic acids
(d) carbohydrates and nucleic acids

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

Question. Which of the following is also known as animal starch?
(a) Glycine
(b) Glycogen
(c) Amylose
(d) Cellulose

Question. Which of the following B group vitamins can be stored in our body? 
(a) Vitamin B₁
(b) Vitamin B₂
(c) Vitamin B₆
(d) Vitamin B₁₂

Question. Which of the following acids is a vitamin?
(a) Aspartic acid
(b) Ascorbic acid
(c) Adipic acid
(d) Saccharic acid

Question. The double helical structure of DNA was proposed by
(a) Watson and Crick
(b) Meichers
(c) Emil Fischer
(d) Khorana

Question. Which one is the complementary base of cytosine in one strand to that in other strand of DNA?
(a) Adenine
(b) Guanine
(c) Thymine
(d) Uracil

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

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

Question. Invert sugar is
(a) chemically inactive form of sugar
(b) equimolecular mixture of glucose and fructose
(c) mixture of glucose and sucrose
(d) a variety of cane sugar

We hope the above multiple choice questions for Class 12 Chemistry for Chapter 14 Biomolecules provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Biomolecules is an important chapter in Class 12 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 12 students. Please go through these and let us know if you have any feedback in the comments section.