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
- Dextroisomer
- Meso-isomer
- Racemic mixture
- Laevoisomer
Question’s Answer: Racemic mixture
How many stereoisomers are possible for CH3CH=CHCHCH(Br)CH3?
- 2-Geometrical isomers
- 2.Optical isomers
- 2-Geometrical and 1 optical isomer
- 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
- Racemization
- Resolution
- Walden inversion
- Epimerization
Question’s Answer: Resolution
Lactic acid is a molecule which shows
- Epimersim
- Optical isomerism
- Tantomeriam
- 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 ____.
- Configuration
- Conformations
- Enantiomers
- Metamers
Question’s Answer: Conformations
Stereoisomers not related to each other as object and minor image are known as
- Enantiomers
- Diastereoisomers
- Antipodes
- Conformations
Question’s Answer: Diastereoisomers
Stereoisomers that can be interconverted by rotation about a single bond are known as _.
- Conformers
- Chain isomers
- Functional isomers
- Tautomers
Question’s Answer: Conformers
Geometrical isomerism is emerged due to which reason?
- High electron density between two substituted carbon
- Restricted rotation of substituents around double bond
- Both a & b
- None of these
Question’s Answer: Restricted rotation of substituents around double bond
In E. Z nomenclature of stereoisomers, E will be assigned to
- If higher priorty group on same direction
- The geometrical isomers having higher priority group on opposite direction assign
- Both a & b
- None of these
Question’s Answer: The geometrical isomers having higher priority group on opposite direction assign
In optical isomerism
- Laevorotatory are represented by (-) sign
- Dextrorotatory are represented by (4)
- Sometimes levo and sometimes dextro are represented by (-) sign
- Both a & b are wrong
Question’s Answer: Laevorotatory are represented by (-) sign
Geometrical isomerism can be exhibited by compounds having ____.
- -N=N-
- >C=N-
- >C=C<
- All of these
Question’s Answer: All of these
Which of the mentioned molecules can exhibit geometrical isomerism?
- CH3CH=C(CH3) 2
- CH3CH=CHCH3
- (CH3) 2C=CH2
- CH3CH=CH2
Question’s Answer: CH3CH=CHCH3
How many optical isomers are possible for CH(OH)COOH CH—(Br) COOH?
- 2
- 4
- 3
- 8
Question’s Answer: 3
Which of the mentioned property has a higher value for trans-isomer as compared to cis-isomer?
- Melting point
- Dipole moment
- Density
- Boiling point
Question’s Answer: Melting point
Which configuration has lowest potential energy?
- Eclipsed
- Skew
- Staggered
- All have same energy
Question’s Answer: Staggered
D(+)glyceraldehydes has the absolute configuration
- R-
- S-
- E-
- Z-
Question’s Answer: R-
Cis-2-Butene on reaction with bromine gives 2,3-dibromobutane which is
- Dextoroisomer
- Meso-isomer
- Racemic mixture
- 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
- –CH2OH>CHO>COOH
- —CH2OH>COOH>CHO
- —COOH>—CH2OH > CHO
Question’s Answer: –COOH>—CHO >–CH2OH
The angel of rotation of plane polarized light in Polari meter relies on _____.
- Concentration of substance
- Nature of the substance
- Length of Polari meter tube
- 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 _____.
- Walden inversion
- Racemisation
- Resolution
- Epimerization
Question’s Answer: Resolution
Which of the mentioned compounds tautomeriam?
- Nitroethane
- Ethanol
- Ethoxyethane
- Chloroethane
Question’s Answer: Nitroethane
Lactic acid is a molecule which shows
- Epimersim
- Tautomerism
- Metamerism
- Optical isomerism
Question’s Answer: Optical isomerism
2-Butanol is optically active because it contains
- an asymmetric carbon atom
- A plane of symmetry
- Centre of symmetry
- A hydroxyl group
Question’s Answer: an asymmetric carbon atom
Which of the mentioned compound will be optically active?
- Lactic acid
- Meso-tartaric acid
- Acetic acid
- Succinic acid
Question’s Answer: Lactic acid
What is the possible number of optical isomers for a compound contained 2 dissimilar asymmetric carbon atoms?
- 2
- 6
- 4
- 8
Question’s Answer: 4
Which of the mentioned statements is wrong about enantiomers?
- Rotate plane of polarized light
- Have the same melting points
- Non superimposable mirror images
- Are superimposable mirror images
Question’s Answer: Are superimposable mirror images
Enantiomers have __________ characteristics?
- Have the same melting point
- Rotate ordinary light
- Are superimposable mirror images
- 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
- By Polari metry
- By mass spectrometry
- By IR spectroscopy
- Using chemical tests
Question’s Answer: By Polari metry
Plane polarized light is affected by
- Chiral molecules
- All polymers
- Identical molecules
- All biomolecules
Question’s Answer: Chiral molecules
A molecule is said to be chiral if it __________.
- contains plane of symmetry
- contains center of symmetry
- cannot be superimposed on its mirror image
- can be superimposed on its mirror image
Question’s Answer: cannot be superimposed on its mirror image
An optically active compound _____.
- Must contain at least fourr carbons
- In solution always gives negative reading in Polari meter
- Must always contain an asymmetric carbon atom
- 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_____.
- Geometrical isomers
- Enantiomers
- Homologous
- Diastereoisomers
Question’s Answer: Geometrical isomers
Which of the mentioned are structural isomers?
- Functional isomers
- Position isomers
- Chain isomers
- All A, B, and C
Question’s Answer: All A, B, and C
n-Butane and 2-methylpropane are examples of ______.
- Functional isomers
- Position isomers
- Chain isomers
- Tautomers
Question’s Answer: Position isomers
1-Propanaol and 2-propanol are examples of____.
- Position isomers
- Chain isomers
- Functional isomers
- Tautomers
Question’s Answer: Position isomers
Acetone and diethyl ether are examples of
- Position isomers
- Chain isomers
- Functional isomers
- Tautomers
Question’s Answer: Functional isomers
Compounds HCN and HNC are ____.
- Conformers
- Metamers
- Functional isomers
- Tautomers
Question’s Answer: Tautomers
Alkyl cyanide and alkyl isocyanides are ____.
- Tautomers
- Functional isomers
- Metamers
- Geometric isomers
Question’s Answer: Functional isomers
Several compounds corresponding to molecular formula C4H10 are ____.
- Functional isomers
- Chain isomers
- Tautomers
- Position isomers
Question’s Answer: Chain isomers
The device which is helpful and used to measure the optical activity is known as
- Polari scope
- Conductivity meter
- Potentiometer
- Photometer
Question’s Answer: Polari scope
In Relative Configuration D & L are assigned __________.
- Number of chiral centers
- In relation to number of possible stereoisomers
- In relation to glyceraldehyde
- None of these
Question’s Answer: In relation to glyceraldehyde
Epimers are the stereoisomer of compound which
- Differ in configuration at one chiral center
- Differ in configuration at particular chiral center in a compound having more than one chiral center
- Differ in configuration at one chiral center only in cyclic compounds
- None of these studying
Question’s Answer: Differ in configuration at one chiral center
In relative stability of conformational isomers of n-butane
- Anti-form lies at lowest energy
- Skew form lies at lower energy
- Both lies at lower energy but sometimes anti goes to higher energy
- None of these
Question’s Answer: Anti-form lies at lowest energy
Which of the mentioned compounds show optical activity?
- Maleic acid
- Sucrose
- Aldehyde
- Oxalic acid
Question’s Answer: Sucrose
Stereoisomers that are related like an object and its mirror image non-super imposable are known as
- Enantiomers
- Chain isomers
- Functional isomers
- Tautomers
Question’s Answer: Enantiomers
The configuration of a compound with reference to the arbitrarily assigned configuration is known as
- Absolute configuration
- Retention of configuration
- Relative configuration
- None of A, B, and C
Question’s Answer: Relative configuration
An equimolar mixture of a pair of enantiomers is known as
- Ideal mixture
- Racemate mixture
- Real mixture
- All A, B, and C
Question’s Answer: Racemate mixture
Which of the mentioned is an element of symmetry?
- Centre of inversion
- Plane of symmetry
- Proper rotation
- 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?
- Physical method
- Biological method
- Chemical method
- All A, B, and C
Question’s Answer: All A, B, and C
The functional isomers of ether are
- Hydrocarbons
- Ketones
- Aldehydes
- Alcohol
Question’s Answer: Alcohol
The least cyclohexane is stable
- Chair
- Boat
- Half chair
Question’s Answer: Half chair
Which of the mentioned molecules can exhibit geometrical isomerism?
- CH3CH=CH₂
- CH3CH=CHCH3
- (CH3) 2C=CH2
- CH3CH=C(CH3)2
Question’s Answer: CH3CH=CHCH3
Stereoisomers not related to each other as object and minor image are known as
- Enantiomers
- Antipodes
- Diastereoisomers
- Conformations
Question’s Answer: Diastereoisomers
Which of the mentioned property has a higher value for trans-isomer as compared to cis-isomer?
- Density
- Dipole moment
- Melting point
- Boiling point
Question’s Answer: Melting point
Which configuration has lowest potential energy?
- Eclipsed
- Staggered
- Skew
- All have same energy
Question’s Answer: Staggered
Which of the mentioned compound will be optically active?
- Succinic acid
- Meso-tartaric acid
- Acetic acid
- Lactic acid
Question’s Answer: Lactic acid
It is possible to distinguish between optical isomers
- Using chemical tests
- By mass spectrometry
- By 1R spectroscopy
- By Polari metry
Question’s Answer: By Polari metry
Plane polarized light is affected by
- Identical molecules
- All polymers
- Chiral molecules
- All biomolecules
Question’s Answer: Chiral molecules
A molecule is considered as chiral if it _____.
- contains plane of symmetry
- contains centre of symmetry
- cannot be superimposed on its mirror image
- 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?
- Must contain at least favor carbons
- When in solution rotate the plane of polarized light
- Must always contain an asymmetric carbon atom
- 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?
- CH3-CH2Br
- BrCH=CHCI
- FCH=CHBr
- ICH=CHCI
Question’s Answer: CH3-CH2Br
In t-butyl alcohol, the tertiary carbon is bonded to:
- Three hydrogen atoms
- Three carbon atoms
- One hydrogen atoms
- 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?
- -CH3
- CH2Cl
- CHO
- -OH
Question’s Answer: -OH
Which of the mentioned groups has the highest priority according to the Cahn- Ingold-Prelog sequence rules?
- CH2CH2CH3
- -CH=CH2
- -C≡CH
- CH2CH2OH
Question’s Answer: -C≡CH
Asymmetric center is characterized by which of the following?
- Having more than one functional groups attached to carbon
- Not having mirror image after a rotation of 180 degree
- Sp3 carbon with 4 different groups attached to carbon
- 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?
- Measure to evaluate degree of rotation of substituents in a chiral molecule
- The ability to rotate the plane of plane – polarized light
- To identify the direction of light (right or left) when it is targeted to chiral molecule
- None of these
Question’s Answer: The ability to rotate the plane of plane – polarized light
Chiral compound are _______ forever
- Have acidic protons
- Optically active
- Have distreomers
- Have enantiomers
Question’s Answer: Optically active
Examples of ______ are Diethyl ether and methyl propyl ether.
- Chain isomers
- Tautomers
- Streoisomers
- Metamers
Question’s Answer: Metamers
Which is not a type of stereoisomer?
- Tautomers
- Optical isomers
- Conformational isomers
- 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
- Functional isomers
- Chain isomers
- Tautomers
- 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 __.
- Stereoisomers
- Chain isomers
- Functional isomers
- Tautomers
Question’s Answer: Stereoisomers
Benzene has
- Axis of symmetry
- Plane of symmetry
- Centre of symmetry
- All of A, B, and C
Question’s Answer: All of A, B, and C
Asymmetric carbon is that
- Which is attached with four different types of substituents
- Which has chiral center
- Which is attached with three different types of substituents
- Both a & b
Question’s Answer: Both a & b
Enantiomers are the stereoisomers which
- Which has at least one chiral center
- Not superimposable to their mirror are images
- Which has at least two chiral center
- None of these
Question’s Answer: Not superimposable to their mirror are images
What is the formula for calculation of Number of stereoisomers?
- (n) is number of substituents
- (n) is number carbon atoms
- (n) is number chiral centers
- None of these
Question’s Answer: (n) is number chiral centers
Stereochemistry studies the compound
- Spatial arrangement
- Rotation of substituents around single bond
- Distribution of substituents in carbon skeleton
- Optical activity
Question’s Answer: Spatial arrangement
The energy difference between staggered and eclipsed conformation of ethane is
- 25 kJ/mol
- 30 kJ/mol
- 12.5 kJ/mol
- 100 kJ/mol
Question’s Answer: 12.5 kJ/mol
What is the total number of conformation of ethane?
- 3
- Infinite
- 7
- 5
Question’s Answer: Infinite
What is the energy difference between boat and chair conformation of cyclohexane?
- 44 kJ/mol
- 12.5 kJ/mol
- 100 kJ/mol
- 50 kJ/mol.
Question’s Answer: 44 kJ/mol
Various compounds corresponding molecular formula C4H10 are ______.
- Functional isomers
- Position isomers
- Tautomers
- Chain isomers
Question’s Answer: Chain isomers
Which of the mentioned methods helpful and used for the determination of configuration of geometrical isomers?
- Dipole moment
- Melting point
- Solubility
- All A, B, and C
Question’s Answer: All A, B, and C
Anthracene is isomeric with which of the following?
- Physical method
- Naphthalene
- Benzene
- Phenanthrene
Question’s Answer: Phenanthrene
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