50 Mcqs Questions for preparation of online exam.
👇
1...Trans - Cyclopropane 1,2 di carboxylic acid is______
👉Optically inactive
👉None of the above
👉Optically active ☑️
👉Meso compound
2...Point group of Bicyclo (2,2,2) Octane is
👉D₃d
👉C₃h
👉D₃h ☑️
👉D₂d
3...The glycosidic bond
👉in maltose is not hydrolyzed in lactose intolerant humans
👉in sucrose is hydrolyzed by bees
👉both (b) and (c) ☑️
👉joins glucose and fructose to form sucrose
4...Arrange the following trans 1,2 Di methyl Cyclohexane conformers in order of its Stability is
👉aa > ee > ea
👉aa > ea > ee
👉ee > aa > ea
👉ee > ea > aa ☑️
5...Which of the following statements is true?
👉Sugar component of a nucleotide is ribose
👉Sugar component of a nucleotide is deoxyribose
👉The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage ☑️
👉The sugar molecule of the nucleotide is in L-configuration
6...An aldo hexose will have _____ stereoisomers
👉16 ☑️
👉2
👉4
👉8
7...Which of the following is not a disaccharide?
👉lactose
👉cellobiose
👉none of these
👉amylose ☑️
8...What is the molecular formula of sucrose?
👉C₁₂H₂₀O₁₁
👉C₁₂H₂₂O₁₁ ☑️
👉C₁₀H₂₀O₁₀
👉C₆H₁₂O₆
9...Which property is found in nucleosides and nucleotides?
👉Both contain an aldose with hydroxyl groups that can tautomerize
👉Both contain an anomeric carbon atom that is part of a β-N-glycosidic bond ☑️
👉Both contain a covalent phosphodister bond that is broken in strong acid
👉Both contain a nitrogenous base, a pentose, and at least one phosphate group
10...A major component of RNA but not of DNA is:
👉adenine
👉cytosine
👉uracil ☑️
👉guanine
11...How many constitutional isomers are possible for the formula C₆H₁₄?
👉4
👉5 ☑️
👉3
👉2
12...Trans 1,2 di carboxylic acid is more stable than its Cis form Because of
👉Torsional angle 30⁰
👉Torsional angle 60⁰
👉Torsional angle 120⁰ ☑️
👉Torsional angle 90⁰
13...Which component is found in both guanosine and uridine?
👉Both contain a pyranose
👉Both contain an aldohexose
👉Both contain a 1-9 - bond.
👉Both contain three hydroxyl groups ☑️
14...Which is a general property of both nucleosides and nucleotides?
👉Both contain a pentose in the form of a furanose ☑️
👉Both contain a hemiacetal or hemiketal bond
👉Both contain at least one 5’-phosphate group
👉Both contain a nitrogenous base that forms covalent H-bonds
15...Which of the following is the highest energy conformation of cyclo hexane?
👉eclipsed
👉chair ☑️
👉boat
👉half- chair
16...Which conformation of trans- 1 - isopropyl - 3 - methyl cyclohexane would be present in greatest amount at equilibrium?
👉The conformation with both groups equatorial
👉The conformation with both groups axial
👉The conformation with the methyl group axial and the isopropyl group equatorial ☑️
👉The conformation with the methyl group equatorial and the isopropyl group axial
17...Which of the following correctly lists the conformations of cyclo hexane in order of increasing energy?
👉chair < boat < twist < half-chair
👉chair < twist < half-chair < boat
👉chair < twist < boat < half-chair ☑️
👉half-chair < boat < twist < chair
18...The sugar molecule in a nucleotide is
👉Pentose ☑️
👉Hexose
👉Tetrose
👉Triose
19...Building blocks of nucleic acids are
👉Amino acids
👉Histones
👉Nucleotides ☑️
👉Nucleosides
20...Which of the statements below correctly describes the chair conformations of trans- 1, 4-di methyl cyclohexane?
👉The higher energy chair conformation contains one axial methyl group and one equatorial Methyl group
👉The two chair conformations are of equal energy
👉The higher energy chair conformation contains two axial methyl groups
👉The lower energy chair conformation contains one axial methyl group and one equatorial Methyl group ☑️
21...Arrange the following conformers of butane in order of energy, lowest to highest
👉eclipsed< gauche< anti< totally eclipsed
👉gauche<eclipsed<anti<totally eclipsed
👉anti < gauche < eclipsed < totally eclipsed ☑️
👉gauche<anti< totally eclipsed<eclipsed
22...Which structural feature is shared by both uracil and thymine?
👉Both contain three nitrogen atoms
👉Both contain two keto groups ☑️
👉Both contain one methyl group
👉Both contain a five-membered ring
23...How many stereo isomers are present in 2-Hydroxy Methyl 1-cyclopropane Carboxylic acid
👉4 ☑️
👉8
👉16
👉2
24...Glycosidic bond in sucrose is____
👉β 1 – 2
👉α 1 – 4
👉β 1 – 4
👉α 1 – 2 ☑️
25...Which of the following is the most stable conformation of 1-bromo propane?
☑️
26...The rotation about the (C₂– C₃) carbon-carbon bond of n-butane requires the energy of about
👉30 kJ/mol
👉3 kJ/mol ☑️
👉50 kJ/mol
👉100 kJ/mol
27...The infinity of intermediate conformations are called ___________
👉Staggered conformations
👉Gauche
👉Skew conformations ☑️
👉Eclipsed conformations
28...Which of the following is least stable?
👉Gauche conformation
👉Anti conformation
👉Eclipsed conformation ☑️
👉Staggered conformation
29...2-bromo cyclohexanone is more stable when
👉Br is at axial Posiiton ☑️
👉Br is at equatorial Posiiton
👉Both Positiion
30...Which of the following is an aldotriose?
👉Dihydroxyacetone
👉Ribulose
👉Erythrose
👉Glyceraldehyde ☑️
31...The glycosidic linkage between two glucose molecules in isomaltose is
👉α 1 – 4
👉β 1 – 6
👉α 1 – 6 ☑️
👉β 1 – 4
32...Identify the purine base of nucleic acids in the following
👉Cytosine
👉Thymine
👉Uracil
👉Adenine ☑️
33...12. Select the odd one from the following
👉xylose
👉erythrose ☑️
👉lyxose
👉arabinose
34...The sugar which forms major component of nucleic acids is
👉mannose
👉maltose
👉ribose ☑️
👉galactose
35...Hydrolysis of lactose yields
👉fructose and galactose
👉galactose and glucose ☑️
👉galactose and fructose
👉glucose and fructose
36...Which of the following statements is a correct description of the most stable conformation of 1, 1, 3- tri methyl cyclohexane?
👉The methyl group at C-3 is equatorial ☑️
👉C-1 is a quaternary carbon and C-3 is a secondary carbon
👉C-1 is a tertiary carbon and C-3 is a secondary carbon
👉C-1 is a tertiary carbon and C-3 is a primary carbon
37...Arrangement of nucleotides in DNA can be seen by
👉Light microscope
👉X-Ray crystallography ☑️
👉Electron microscope
👉Ultra centrifuge
38...The compound that consists of ribose linked by an N-glycosidic bond to N-9 of adenine is:
👉a pyrimidine nucleotide
👉deoxyribonucleoside
👉a purine nucleotide
👉adenosine ☑️
39...Which of the following statements is true?
👉Sugar component of a nucleotide is deoxyribose
👉The sugar molecule of the nucleotide is in L-configuration
👉The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage ☑️
👉Sugar component of a nucleotide is ribose
40...Conformations are different arrangements of atoms that can be converted into one another by rotation about
👉Double bond
👉Covalent bond
👉Single bond ☑️
👉Triple bond
41...Which cyclo alkane has the least ring strain
👉Cyclo propane
👉Cyclo hexane ☑️
👉Cyclo butane
👉Cyclo pentane
42...In the most stable conformation of cis-1,4-dimethyl cyclohexane, the methyl groups are:
👉alternating between being both axial and both equatorial
👉both axial
👉both equatorial
👉one axial, one equatorial ☑️
43...The energy required to rotate n-butane molecule about the carbon-carbon bond is called
👉Enantiomeric energy
👉Torsional energy ☑️
👉Potential energy
👉Rotational energy
44...Gauche conformation is less stable due to _______
👉Torsional strain
👉Hydrogen bonding
👉Vander Waal’s repulsion ☑️
👉Covalent bonding
45...Which is the proper chair conformation of menthol?
☑️
46...What is the composition of nucleoside?
👉a base + a sugar + phosphate
👉a sugar + a phosphate
👉a base + a sugar ☑️
👉a base + a phosphate
47...Humans are unable to digest
👉starch
👉complex carbohydrates
👉cellulose ☑️
👉denatured proteins
48...In gauche conformations, the methyl groups are___________
👉180⁰ a part
👉60⁰ a part ☑️
👉360⁰ a part
👉90⁰ a part
49...Which of the following is a keto tetrose?
👉Xylulose
👉Psicose
👉Erythrulose ☑️
👉Sorbose
50...which form is more stable in Cyclohexane -1,4 diol
👉twist
👉Chair
👉Half Chair
👉Boat ☑️
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