Stereochemistry

Question 1

What is stereochemistry

Answer 1

This is the branch of chemistry that deals with the three-dimensional structure of a molecule and their effects on physical and chemical properties

Question 2

What is Isomerism

Answer 2

Isomerism is a phenomenon that describes two or more compounds having the same molecular formula but different structural formula

Question 3

What is the difference between Allotropy and Isomerism?

Answer 3

Allotropy: Inorganic elements
Isomerism: Organic compounds

Question 4

What are the types of isomers

Answer 4

Constitutional
Conformational
Stereoisomers

Question 5

The term connectivity means

Answer 5

All the atoms in a molecule are connected in the same sequence.

Question 6

What are the types of constitutional Isomerism

Answer 6

Chain Isomerism
Positional isomerism
Functional isomerism

Question 7

Compounds which have different arrangements of atoms in space while having same atoms bonded to each other are said to have
a) position isomerism
b) functional group isomerism
c) chain isomerism
d) stereoisomerism

Answer 7

Stereoisomerism

Question 8

Which of the following can make difference in optical isomers?
a) heat
b) temperature
c) polarized light
d) pressure

Answer 8

Polarized light

Question 9

Which of the following is an alkane which can exhibit optical activity?
a) Neopentane
b) Isopentane
c) 3–Methylpentane
d) 3–Methylhexane

Answer 9

3-Methylhexane

Question 10

Which of the following statements most accurately describes the stereochemistry between the various cyclohexanes?
a) Cis-1,2-dichlorocyclohexane and trans-1,2-dichlorocyclohexane rotate plane-polarized light in opposite directions, and together in equal proportions form a racemic mixture
b) The diaxial and diequatorial forms of trans-1,3-dichlorohexane can be separated by their differing physical properties
c) Only cis-1,4-dichlorocyclohexane is achiral due to a plane of symmetry, and cis-1,4-dichlorocyclohexane is diastereomeric to trans-1,4-dichlorocyclohexane
d) The conformational isomers of trans-1,2-dichlorocyclohexane are enantiomers, which are not interconvertible, but resolvable

Answer 10

D

Question 11

Lactic acid is a molecule which shows

Epimersim
Optical isomerism
Tantomeriam
Metamerism

Answer 11

Optical Isomerism

Question 12

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

Answer 12

Conformations

Question 13

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

Enantiomers
Diastereoisomers
Antipodes
Conformations

Answer 13

Diastereoisomers

Question 14

Geometrical isomerism is emerged due to which reason?

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

Answer 14

Restricted rotation of substituents around double bond.

Question 15

In optical isomerism

A.Laevorotatory are represented by (-) sign
B. Dextrorotatory are represented by (4)
C. Sometimes levo and sometimes dextro are represented by (-) sign
Both a & b are wrong

Answer 15

A.

Question 16

Geometrical isomerism can be exhibited by compounds having ____.

-N=N-
>C=N-
>C=C<
All of these

Answer 16

All of these

Question 17

Which of the mentioned molecules can exhibit geometrical isomerism?

CH3CH=C(CH3)2

CH3CH=CHCH3

(CH3)2C=CH2

CH3CH=CH2

Answer 17

A

Question 18

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

Melting point

Dipole moment

Density

Boiling point

Answer 18

Melting point

Question 19

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

Answer 19

A. Conc of the substance
B. Nature of the substance
C. Length of polari meter tube

Question 20

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

Answer 20

Are super impossible mirror images

Question 21

Enantiomers have __________ characteristics?

Have the same melting point
Rotate ordinary light
Are superimposable mirror images
React with optically active molecules at the same rate

Answer 21

Have the same melting point

Question 22

Plane polarized light is affected by

Chiral molecules
All polymers
Identical molecules
All biomolecules

Answer 22

Chiral molecules

Question 23

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

Answer 23

Cannot be superimposed on its mirror image

Question 24

An optically active compound _____.

A. Must contain at least fourr carbons
B. In solution always gives negative reading in Polari meter
C. Must always contain an asymmetric carbon atom
D. When in solution rotate the plane of polarized light

Answer 24

D

Question 25

Maleic acid and fumaric acid are_____. Geometrical isomers Enantiomers Homologous Diastereoisomers

Answer 25

Geometric isomers

Question 26

n-Butane and 2-methylpropane are examples of ______. Functional isomers Position isomers Chain isomers Tautomers

Answer 26

Position isomers

Question 27

Acetone and diethyl ether are examples of Position isomers Chain isomers Functional isomers Tautomers

Answer 27

Functional isomers

Question 28

Compounds HCN and HNC are ____. Conformers Metamers Functional isomers Tautomers

Answer 28

Tautomers

Question 29

Alkyl cyanide and alkyl isocyanides are ____. Tautomers Functional isomers Metamers Geometric isomers

Answer 29

Functional isomers

Question 30

Thalidomide is used to manage

Answer 30

Morning sickness

Question 31

The device which is helpful and used to measure the optical activity is known as Polari scope Conductivity meter Potentiometer Photometer

Answer 31

Polari scope OR Polarimeter

Question 32

Which of the mentioned compounds show optical activity? Maleic acid Sucrose Aldehyde Oxalic acid

Answer 32

Sucrose

Question 33

A carbon atom which is bonded to four different groups is called

Answer 33

Chiral carbon atom

Question 34

What are optical isomers

Answer 34

Optical isomers are isomers which have the ability to rotate the plane of polarized light. The exhibit optical activity.

Question 35

The ability to rotate plane of polarised light is because

Answer 35

They lack symmetry

Question 36

Stereoisomers that are related like an object and its mirror image non-super imposable are known as Enantiomers Chain isomers Functional isomers Tautomers

Answer 36

Enatiomers

Question 37

Compounds which rotate plane of polarized light are called

Answer 37

Optically active compounds

Question 38

Benzene has Axis of symmetry Plane of symmetry Centre of symmetry All of A, B, and C

Answer 38

All

Question 39

What are the conditions for optical isomerism

Answer 39

1. Spiraling 2. Di-symmetry 3. Non-superimposable(enatiomers)

Question 40

Rotation of plane polarized light can be of what types

Answer 40

Dextorotatory(clockwise) Laevorotatory(Anticlockwise)