Stereochemistry MCQs [Organic Chemistry]

MCQs are based on questions and answers on Stereochemistry in organic chemistry.

Cis-2-Butene on reaction with bromine gives 2,3-dibromobutane which is

  1. Dextroisomer
  2. Meso-isomer
  3. Racemic mixture
  4. Laevoisomer

Question’s Answer: Racemic mixture


How many stereoisomers are possible for CH3CH=CHCHCH(Br)CH3?

  1. 2-Geometrical isomers
  2. 2.Optical isomers
  3. 2-Geometrical and 1 optical isomer
  4. 2-Geometrical and 2-optial isomers

Question’s Answer: 2-Geometrical and 2-optial isomers


Process of separating the racemic mixture into optically active isomers is famous as

  1. Racemization
  2. Resolution
  3. Walden inversion
  4. Epimerization

Question’s Answer: Resolution


Lactic acid is a molecule which shows

  1. Epimersim
  2. Optical isomerism
  3. Tantomeriam
  4. Metamerism

Question’s Answer: Optical isomerism


Different arrangements of groups in space which can be converted into one another by rotation around a single bond are known as ____.

  1. Configuration
  2. Conformations
  3. Enantiomers
  4. Metamers

Question’s Answer: Conformations


Stereoisomers not related to each other as object and minor image are known as

  1. Enantiomers
  2. Diastereoisomers
  3. Antipodes
  4. Conformations

Question’s Answer: Diastereoisomers


Stereoisomers that can be interconverted by rotation about a single bond are known as _.

  1. Conformers
  2. Chain isomers
  3. Functional isomers
  4. Tautomers

Question’s Answer: Conformers


Geometrical isomerism is emerged due to which reason?

  1. High electron density between two substituted carbon
  2. Restricted rotation of substituents around double bond
  3. Both a & b
  4. None of these

Question’s Answer: Restricted rotation of substituents around double bond


In E. Z nomenclature of stereoisomers, E will be assigned to

  1. If higher priorty group on same direction
  2. The geometrical isomers having higher priority group on opposite direction assign
  3. Both a & b
  4. None of these

Question’s Answer: The geometrical isomers having higher priority group on opposite direction assign


In optical isomerism

  1. Laevorotatory are represented by (-) sign
  2. Dextrorotatory are represented by (4)
  3. Sometimes levo and sometimes dextro are represented by (-) sign
  4. Both a & b are wrong

Question’s Answer: Laevorotatory are represented by (-) sign


Geometrical isomerism can be exhibited by compounds having ____.

  1. -N=N-
  2. >C=N-
  3. >C=C<
  4. All of these

Question’s Answer: All of these



Which of the mentioned molecules can exhibit geometrical isomerism?

  1. CH3CH=C(CH3) 2
  2. CH3CH=CHCH3
  3. (CH3) 2C=CH2
  4. CH3CH=CH2

Question’s Answer: CH3CH=CHCH3


How many optical isomers are possible for CH(OH)COOH CH—(Br) COOH?

  1. 2
  2. 4
  3. 3
  4. 8

Question’s Answer: 3


Which of the mentioned property has a higher value for trans-isomer as compared to cis-isomer?

  1. Melting point
  2. Dipole moment
  3. Density
  4. Boiling point

Question’s Answer: Melting point


Which configuration has lowest potential energy?

  1. Eclipsed
  2. Skew
  3. Staggered
  4. All have same energy

Question’s Answer: Staggered


D(+)glyceraldehydes has the absolute configuration

  1. R-
  2. S-
  3. E-
  4. Z-

Question’s Answer: R-


Cis-2-Butene on reaction with bromine gives 2,3-dibromobutane which is

  1. Dextoroisomer
  2. Meso-isomer
  3. Racemic mixture
  4. Levoisomer

Question’s Answer: Racemic mixture


According to R, S system the correct order of priority of the following groups is

A.–COOH>—CHO >–CH2OH

  1. –CH2OH>CHO>COOH
  2. —CH2OH>COOH>CHO
  3. —COOH>—CH2OH > CHO

Question’s Answer: –COOH>—CHO >–CH2OH


The angel of rotation of plane polarized light in Polari meter relies on _____.

  1. Concentration of substance
  2. Nature of the substance
  3. Length of Polari meter tube
  4. All A, B, and C

Question’s Answer: All A, B, and C


Process of separating the racemic mixture into optically active isomers is famous as _____.

  1. Walden inversion
  2. Racemisation
  3. Resolution
  4. Epimerization

Question’s Answer: Resolution


Which of the mentioned compounds tautomeriam?

  1. Nitroethane
  2. Ethanol
  3. Ethoxyethane
  4. Chloroethane

Question’s Answer: Nitroethane


Lactic acid is a molecule which shows

  1. Epimersim
  2. Tautomerism
  3. Metamerism
  4. Optical isomerism

Question’s Answer: Optical isomerism


2-Butanol is optically active because it contains

  1. an asymmetric carbon atom
  2. A plane of symmetry
  3. Centre of symmetry
  4. A hydroxyl group

Question’s Answer: an asymmetric carbon atom


Which of the mentioned compound will be optically active?

  1. Lactic acid
  2. Meso-tartaric acid
  3. Acetic acid
  4. Succinic acid

Question’s Answer: Lactic acid


What is the possible number of optical isomers for a compound contained 2 dissimilar asymmetric carbon atoms?

  1. 2
  2. 6
  3. 4
  4. 8

Question’s Answer: 4


Which of the mentioned statements is wrong about enantiomers?

  1. Rotate plane of polarized light
  2. Have the same melting points
  3. Non superimposable mirror images
  4. Are superimposable mirror images

Question’s Answer: Are superimposable mirror images


Enantiomers have __________ characteristics?

  1. Have the same melting point
  2. Rotate ordinary light
  3. Are superimposable mirror images
  4. React with optically active molecules at the same rate

Question’s Answer: Have the same melting point


It is possible to distinguish between optical isomers

  1. By Polari metry
  2. By mass spectrometry
  3. By IR spectroscopy
  4. Using chemical tests

Question’s Answer: By Polari metry


Plane polarized light is affected by

  1. Chiral molecules
  2. All polymers
  3. Identical molecules
  4. All biomolecules

Question’s Answer: Chiral molecules


A molecule is said to be chiral if it __________.

  1. contains plane of symmetry
  2. contains center of symmetry
  3. cannot be superimposed on its mirror image
  4. can be superimposed on its mirror image

Question’s Answer: cannot be superimposed on its mirror image


An optically active compound _____.

  1. Must contain at least fourr carbons
  2. In solution always gives negative reading in Polari meter
  3. Must always contain an asymmetric carbon atom
  4. When in solution rotate the plane of polarized light

Question’s Answer: When in solution rotate the plane of polarized light


Maleic acid and fumaric acid are_____.

  1. Geometrical isomers
  2. Enantiomers
  3. Homologous
  4. Diastereoisomers

Question’s Answer: Geometrical isomers


Which of the mentioned are structural isomers?

  1. Functional isomers
  2. Position isomers
  3. Chain isomers
  4. All A, B, and C

Question’s Answer: All A, B, and C


n-Butane and 2-methylpropane are examples of ______.

  1. Functional isomers
  2. Position isomers
  3. Chain isomers
  4. Tautomers

Question’s Answer: Position isomers


1-Propanaol and 2-propanol are examples of____.

  1. Position isomers
  2. Chain isomers
  3. Functional isomers
  4. Tautomers

Question’s Answer: Position isomers


Acetone and diethyl ether are examples of

  1. Position isomers
  2. Chain isomers
  3. Functional isomers
  4. Tautomers

Question’s Answer: Functional isomers


Compounds HCN and HNC are ____.

  1. Conformers
  2. Metamers
  3. Functional isomers
  4. Tautomers

Question’s Answer: Tautomers


Alkyl cyanide and alkyl isocyanides are  ____.

  1. Tautomers
  2. Functional isomers
  3. Metamers
  4. Geometric isomers

Question’s Answer: Functional isomers


Several compounds corresponding to molecular formula C4H10 are   ____.

  1. Functional isomers
  2. Chain isomers
  3. Tautomers
  4. Position isomers

Question’s Answer: Chain isomers



The device which is helpful and used to measure the optical activity is known as

  1. Polari scope
  2. Conductivity meter
  3. Potentiometer
  4. Photometer

Question’s Answer: Polari scope


In Relative Configuration D & L are assigned __________.

  1. Number of chiral centers
  2. In relation to number of possible stereoisomers
  3. In relation to glyceraldehyde
  4. None of these

Question’s Answer: In relation to glyceraldehyde


Epimers are the stereoisomer of compound which

  1. Differ in configuration at one chiral center
  2. Differ in configuration at particular chiral center in a compound having more than one chiral center
  3. Differ in configuration at one chiral center only in cyclic compounds
  4. None of these studying

Question’s Answer: Differ in configuration at one chiral center


In relative stability of conformational isomers of n-butane

  1. Anti-form lies at lowest energy
  2. Skew form lies at lower energy
  3. Both lies at lower energy but sometimes anti goes to higher energy
  4. None of these

Question’s Answer: Anti-form lies at lowest energy


Which of the mentioned compounds show optical activity?

  1. Maleic acid
  2. Sucrose
  3. Aldehyde
  4. Oxalic acid

Question’s Answer: Sucrose


Stereoisomers that are related like an object and its mirror image  non-super imposable are known as

  1. Enantiomers
  2. Chain isomers
  3. Functional isomers
  4. Tautomers

Question’s Answer: Enantiomers


The configuration of a compound with reference to the arbitrarily assigned  configuration is known as

  1. Absolute configuration
  2. Retention of configuration
  3. Relative configuration
  4. None of A, B, and C

Question’s Answer: Relative configuration


An equimolar mixture of a pair of enantiomers is known as

  1. Ideal mixture
  2. Racemate mixture
  3. Real mixture
  4. All A, B, and C

Question’s Answer: Racemate mixture


Which of the mentioned is an element of symmetry?

  1. Centre of inversion
  2. Plane of symmetry
  3. Proper rotation
  4. All A, B, and C

Question’s Answer: All A, B, and C


Which of the mentioned methods is helpful and used for resolution of racemic mixture?

  1. Physical method
  2. Biological method
  3. Chemical method
  4. All A, B, and C

Question’s Answer: All A, B, and C



The functional isomers of ether are

  1. Hydrocarbons
  2. Ketones
  3. Aldehydes
  4. Alcohol

Question’s Answer: Alcohol


The least cyclohexane is stable

  1. Chair
  2. Boat
  3. Half chair

Question’s Answer: Half chair


Which of the mentioned molecules can exhibit geometrical isomerism?

  1. CH3CH=CH₂
  2. CH3CH=CHCH3
  3. (CH3) 2C=CH2
  4. CH3CH=C(CH3)2

Question’s Answer: CH3CH=CHCH3


Stereoisomers not related to each other as object and minor image are known as

  1. Enantiomers
  2. Antipodes
  3. Diastereoisomers
  4. Conformations

Question’s Answer: Diastereoisomers


Which of the mentioned property has a higher value for trans-isomer as compared to cis-isomer?

  1. Density
  2. Dipole moment
  3. Melting point
  4. Boiling point

Question’s Answer: Melting point


Which configuration has lowest potential energy?

  1. Eclipsed
  2. Staggered
  3. Skew
  4. All have same energy

Question’s Answer: Staggered


Which of the mentioned compound will be optically active?

  1. Succinic acid
  2. Meso-tartaric acid
  3. Acetic acid
  4. Lactic acid

Question’s Answer: Lactic acid


It is possible to distinguish between optical isomers

  1. Using chemical tests
  2. By mass spectrometry
  3. By 1R spectroscopy
  4. By Polari metry

Question’s Answer: By Polari metry


Plane polarized light is affected by

  1. Identical molecules
  2. All polymers
  3. Chiral molecules
  4. All biomolecules

Question’s Answer: Chiral molecules

A molecule is considered as chiral if it _____.

  1. contains plane of symmetry
  2. contains centre of symmetry
  3. cannot be superimposed on its mirror image
  4. can be superimposed on its mirror image

Question’s Answer: cannot be superimposed on its mirror image


Which statement is true regarding optically active compound?

  1. Must contain at least favor carbons
  2. When in solution rotate the plane of polarized light
  3. Must always contain an asymmetric carbon atom
  4. In solution always gives negative reading in Polari meter

Question’s Answer: When in solution rotate the plane of polarized light


Which of the mentioned compounds will not show geometrical isomerism?

  1. CH3-CH2Br
  2. BrCH=CHCI
  3. FCH=CHBr
  4. ICH=CHCI

Question’s Answer: CH3-CH2Br


In t-butyl alcohol, the tertiary carbon is bonded to:

  1. Three hydrogen atoms

 

  1. Three carbon atoms
  2. One hydrogen atoms
  3. No hydrogen atoms

Question’s Answer: Three carbon atoms


Which of the mentioned groups has the highest priority according to the Cahn-Ingold-Prelog sequence rules?

  1. -CH3
  2. CH2Cl
  3. CHO
  4. -OH

Question’s Answer: -OH


Which of the mentioned groups has the highest priority according to the Cahn- Ingold-Prelog sequence rules?

  1. CH2CH2CH3
  2. -CH=CH2
  3. -C≡CH
  4. CH2CH2OH

Question’s Answer: -C≡CH


Asymmetric center is characterized by which of the following?

  1. Having more than one functional groups attached to carbon
  2. Not having mirror image after a rotation of 180 degree
  3. Sp3 carbon with 4 different groups attached to carbon
  4. All of A, B, and C

Question’s Answer: Sp3 carbon with 4 different groups attached to carbon


Which statement is true regarding Optical activity?

  1. Measure to evaluate degree of rotation of substituents in a chiral molecule
  2. The ability to rotate the plane of plane – polarized light
  3. To identify the direction of light (right or left) when it is targeted to chiral molecule
  4. None of these

Question’s Answer: The ability to rotate the plane of plane – polarized light


Chiral compound are _______ forever

  1. Have acidic protons
  2. Optically active
  3. Have distreomers
  4. Have enantiomers

Question’s Answer: Optically active


Examples of ______ are Diethyl ether and methyl propyl ether.

  1. Chain isomers
  2. Tautomers
  3. Streoisomers
  4. Metamers

Question’s Answer: Metamers


Which is not a type of stereoisomer?

  1. Tautomers
  2. Optical isomers
  3. Conformational isomers
  4. Geometrical isomers

Question’s Answer: Tautomers


Two structural isomers which differ in the relative positions of their atoms and are readily inter convertible are known as

  1. Functional isomers
  2. Chain isomers
  3. Tautomers
  4. Position isomers

Question’s Answer: Tautomers


Isomers that have the same structural formula but differ in the arrangement of atoms in the three dimensional space are known as __.

  1. Stereoisomers
  2. Chain isomers
  3. Functional isomers
  4. Tautomers

Question’s Answer: Stereoisomers


Benzene has

  1. Axis of symmetry
  2. Plane of symmetry
  3. Centre of symmetry
  4. All of A, B, and C

Question’s Answer: All of A, B, and C


Asymmetric carbon is that

  1. Which is attached with four different types of substituents
  2. Which has chiral center
  3. Which is attached with three different types of substituents
  4. Both a & b

Question’s Answer: Both a & b


Enantiomers are the stereoisomers which

  1. Which has at least one chiral center
  2. Not superimposable to their mirror are images
  3. Which has at least two chiral center
  4. None of these

Question’s Answer: Not superimposable to their mirror are images


What is the formula for calculation of Number of stereoisomers?

  1. (n) is number of substituents
  2. (n) is number carbon atoms
  3. (n) is number chiral centers
  4. None of these

Question’s Answer: (n) is number chiral centers


Stereochemistry studies the compound

  1. Spatial arrangement
  2. Rotation of substituents around single bond
  3. Distribution of substituents in carbon skeleton
  4. Optical activity

Question’s Answer: Spatial arrangement


The energy difference between staggered and eclipsed conformation of ethane is

  1. 25 kJ/mol
  2. 30 kJ/mol
  3. 12.5 kJ/mol
  4. 100 kJ/mol

Question’s Answer: 12.5 kJ/mol


What is the total number of conformation of ethane?

  1. 3
  2. Infinite
  3. 7
  4. 5

Question’s Answer: Infinite


What is the energy difference between boat and chair conformation of cyclohexane?

  1. 44 kJ/mol
  2. 12.5 kJ/mol
  3. 100 kJ/mol
  4. 50 kJ/mol.

Question’s Answer: 44 kJ/mol


Various compounds corresponding molecular formula C4H10 are ______.

  1. Functional isomers
  2. Position isomers
  3. Tautomers
  4. Chain isomers

Question’s Answer: Chain isomers


Which of the mentioned methods helpful and used for the determination of configuration of geometrical isomers?

  1. Dipole moment
  2. Melting point
  3. Solubility
  4. All A, B, and C

Question’s Answer: All A, B, and C


Anthracene is isomeric with which of the following?

  1. Physical method
  2. Naphthalene
  3. Benzene
  4. Phenanthrene

Question’s Answer: Phenanthrene

More Organic chemistry MCQs

  1. Organic chemistry MCQs
  2. Active Methylene Compounds MCQs
  3. Alcohols and Phenols MCQs
  4. Carbonyl Compounds MCQs
  5. Halogenated Organic Compounds MCQs
  6. Carboxylic Acids MCQs
  7. Hydrocarbons MCQs
  8. Nitrogen-Containing Organic Compounds MCQs
  9. Polymers MCQs
  10. Nomenclature of Organic Compounds MCQs
  11. Organic Acids and Bases MCQs
  12. Organic Spectroscopy MCQs
  13. Purification and Characterization of Organic Compounds MCQs
  14. Reaction Mechanism MCQs
  15. Stereochemistry MCQs
  16. Organic Molecules MCQs
  17. CHEMISTRY MCQs From all subjects of  Chemistry

Prof.Fazal Rehman Shamil (Available for Professional Discussions)
1. Message on Facebook page for discussions,
2. Video lectures on Youtube
3. Email is only for Advertisement/business enquiries.