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Unit I org III

Total questions: 40

Worksheet time: 22mins

Name
Class
Date
1.

How many chiral centres are there in tartaric acid?

a)

3

b)

2

c)

1

d)

0

2.

How many chiral centres does glucose have?

a)

1

b)

2

c)

4

d)

6

3.
Which of the following statement is FALSE about stereoisomerism?
a)
Same molecular formula
b)
Same structural formula
c)
Different structural arrangement or connectivity
d)
Different spatial arrangement
4.
Which of the following statement is FALSE about optical isomers?
a)
At least 1 asymmetrical chiral center
b)
Mirror images of each other
c)
Non superimposable
d)
carbon center bonded to 4 groups
5.

Chiral carbons will produce _____________.

a)

structural isomers

b)

optical isomers

c)

polymers

d)

monomers

6.

There are two main forms of isomerism, which are?

a)

Structural isomerism and Stereoisomerism

b)

Stereoisomerism and Physical isomerism

c)

Chemical isomerism and Stereoisomerism

d)

Structural isomers and Geometric Isomers

7.

The stereoisomers which are not interconvertible under normal condition are called

a)

Conformational isomerims

b)

Configurational isomers

8.

The stereoisomers which are interconvertible by free rotation about carbon carbon single born they are called

a)

Configurational isomers

b)

Conformational isomers

9.

What is the (best) definition of 'stereoisomers'?

a)

Compounds with the same empirical formula but different molecular formulae

b)

Unsaturated branched molecules

c)

Molecules that come in two different forms

d)

Compounds with the same structural formula but a different arrangement of atoms in space

10.

Constitutional isomers have the same molecular formula but different connectivity

a)

True

b)

False

11.

What is the relationship between 1 and 2?

a)

diastereoisomers

b)

enantiomers

c)

no relationship

d)

meso compounds

12.

What is the relationship between 1 and 4?

a)

diastereoisomers

b)

enantiomers

c)

no relationship

d)

meso compounds

13.

Is it true that enantiomer have the same physical and chemical properties?

a)

Yes

b)

False

14.

Identify the statements that are properties of enantiomers. (multiple answers)

a)

At least 1 asymmetrical chiral carbon atom

b)

Mirror images of each other

c)

Superimposable

d)

Chiral carbon bonded to any 4 groups

e)

Chiral carbon cannot be bonded to hydrogen

15.

An asymmetric carbon is the same as a...

a)

achiral carbon

b)

chiral carbon

c)

prochiral carbon

d)

axial carbon

16.

What property can be assigned to a carbon atom that has four different atoms or structural groups attached to it?

a)

isomerity

b)

chirality

c)

chivalry

d)

geometry

17.

Can this compound can form optical isomers?

a)

No

b)

yes

c)

depends on whether it wants to or not

18.

Which of the following is a chiral molecule?

a)

CH2BrI

b)

CH3CBr2Cl

c)

(CH3)2CHCl

d)

CH3CHBrCH2CH3

19.

Optical activity is the property in which a substance is unable to rotate the plane of polarisation

a)

True

b)

False

20.

Which among the following defines Meso forms of isomers

a)

Meso form is optically inactive due to external compensation

b)

The molecules of the meso isomers are chiral

c)

It can be separated into optically active enantiometric pairs

d)

It is a single compound

21.

How many stereoisomer that aldotriose have ?

a)

16

b)

8

c)

4

d)

2

22.

How many total stereoisomers are possible for this molecule, and why?

a)

4 stereoisomers, because there are 2 stereocenters.

b)

4 stereoisomers, because there are 2 enantiomer pairs.

c)

3 stereoisomers, because their are 2 stereocenters.

d)

3 stereoisomers, because the molecule shown is a meso compound.

23.

Assign the configuration of the below two structures

a)

S,S

b)

S,R

c)

R,S

d)

R,R,

24.

A racemic mixture is optically active.

a)

yes

b)

no

25.

Which of the substituents are ranked as the highest priority based on Cahn-Ingold-Prelog ranking rules?

a)

-C≡CH

b)

-CH2CH3

c)

-CH(CH3)2

26.

Is the following R or S?

a)

R

b)

S

27.

Is the following R or S?

a)

R

b)

S

28.

Is the following R or S?

a)

R

b)

S

29.

Is the following R or S?

a)

R

b)

S

30.

Is the following R or S?

a)

R

b)

S

31.

Is the following R or S?

a)

R

b)

S

32.

Label each Molecule as Chiral or Achiral

a)

Chiral, Achiral, Achiral, Chiral

b)

Chiral, Chiral, Achiral, Achiral

c)

Chiral, Achiral, Chiral, Achiral

d)

Achiral, Chiral, Chiral, Achiral

33.

What is the Relationship between these Molecules?

a)

Same Molecule

b)

Diastereomers

c)

Enantiomers

d)

Constitutional Isomers

34.

The absolute configuration at the 2 chiral centres in D- Ribulose is

a)

3S4S

b)

2S3S

c)

2R3R

d)

3R4R

35.

Which of the substituents are ranked as the lowest priority based on Cahn-Ingold-Prelog ranking rules?

a)

-C(O)H

b)

-CH2OH

c)

-CH2-O-C(O)CH3

36.

Give the correct absolute configuration on the labelled chiral carbon in 2-iodobutane

a)

S

b)

R

c)

cis

d)

trans

37.

Select all molecules that exhibit stereoisomerism.

a)
b)
c)
d)
38.

How many stereoisomers are there for the following structure?

a)

1

b)

2

c)

3

d)

4

39.

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

a)

C≡CH

b)

CH=CH2

c)

CH(OH)CH3

d)

CH2CH2OH

40.

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

a)

CH3

b)

CH2Cl

c)

CH2OH

d)

CHO

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