Free Printable Naming Isomers

1.

Given a formula representing a compound:Which formula represents an isomer of this compound?

a)

A) C2H6O

b)

B) C3H8O

c)

C) C2H4O2

d)

D) C2H5OH

2.

Which is an isomer of

a)

b)

c)

d)

3.

Given the formula representing a compound:

Which formula represents an isomer of this compound?

a)

b)

c)

d)

4.

Name the molecule using E/Z naming system

a)

[Z] 1,2 dichloroethene

b)

[E] 1,2 dichloroethene

c)

[Z] 1,2 dichloroethane

d)

[E] 1,2 dichloroethane

5.

Name the molecule using E/Z naming system

a)

[Z] 2-chlorobut-2-ene

b)

[E] 2-chlorobut-2-ene

c)

[Z] 1 chloro, 1,2-dimethylethene

d)

[E] 1 chloro, 1,2-dimethylethene

6.

Glucose and galactose have the same molecular formula but a different arrangement of the atoms. These molecules can be referred to each other as

a)

Ions

b)

Isotopes

c)

Isomers

d)

radioactive

7.

Which of the following is an example of structural isomers?

a)

Butane and isobutane

b)

Glucose and fructose

c)

Ethane and propane

d)

Methanol and ethanol

8.

What is the main difference between cis and trans isomers?

a)

Different molecular formulas

b)

Different connectivity of atoms

c)

Different spatial arrangement of atoms

d)

Different functional groups

9.

Which of the following pairs are stereoisomers?

a)

$C_2H_6O$ and $C_3H_8O$

b)

$C_4H_{10}$ and $C_4H_{10}O$

c)

$C_6H_{12}O_6$ and $C_6H_{12}O_6$

d)

$C_2H_4Cl_2$ (cis) and $C_2H_4Cl_2$ (trans)

10.

What type of isomerism is exhibited by $C_4H_8$ ?

a)

Chain isomerism

b)

Geometric isomerism

c)

Optical isomerism

d)

Functional isomerism

11.

Which of the following compounds can exhibit optical isomerism?

a)

$CH_3CH_2OH$

b)

$CH_3COOH$

c)

$CH_3CH(OH)CH_3$

d)

$CH_3CH_2CH_2CH_3$

12.

What is the characteristic feature of enantiomers?

a)

They have different molecular formulas

b)

They are mirror images of each other

c)

They have different functional groups

d)

They have different connectivity of atoms

13.

Which of the following is a pair of functional isomers?

a)

Ethanol and dimethyl ether

b)

Propane and butane

c)

Glucose and galactose

d)

Ethene and ethyne

14.

Which of the following is true about isomers?

a)

They always have different physical properties

b)

They always have different chemical properties

c)

They have the same molecular formula but different structures

d)

They have different molecular formulas

15.

Which of the following is an example of chain isomerism?

a)

Pentane and 2-methylbutane

b)

Ethene and ethyne

c)

Propene and propyne

d)

Methanol and ethanol

16.

What is the main characteristic of positional isomers?

a)

Different functional groups

b)

Different positions of the same functional group

c)

Different molecular formulas

d)

Different connectivity of atoms

17.

Which of the following is an example of tautomeric isomerism?

a)

Keto and enol forms of a compound

b)

Cis and trans forms of a compound

c)

Optical isomers of a compound

d)

Chain isomers of a compound

18.

Which of the following statements is true about geometric isomers?

a)

They have different molecular formulas

b)

They have different connectivity of atoms

c)

They have different spatial arrangements around a double bond

d)

They have different functional groups

19.

Which of the following is an example of optical isomerism in nature?

a)

$\text{D-Glucose}$ and $\text{L-Glucose}$

b)

$\text{Cis-2-butene}$ and $\text{Trans-2-butene}$

c)

$\text{Ethanol}$ and $\text{Dimethyl ether}$

d)

$\text{Propane}$ and $\text{Butane}$

20.

Which of the following is an example of a meso compound?

a)

$\text{2,3-Butanediol}$

b)

$\text{2-Butanol}$

c)

$\text{2-Methylpropane}$

d)

$\text{2,2-Dimethylpropane}$

21.

What is the main feature of a meso compound?

a)

It is optically active

b)

It has an internal plane of symmetry

c)

It has different molecular formulas

d)

It has different functional groups

22.

Which of the following is an example of a pair of enantiomers?

a)

$\text{(R)-2-butanol}$ and $\text{(S)-2-butanol}$

b)

$\text{Cis-2-butene}$ and $\text{Trans-2-butene}$

c)

$\text{Ethanol}$ and $\text{Dimethyl ether}$

d)

$\text{Propane}$ and $\text{Butane}$

23.

Which of the following is an example of a pair of diastereomers?

a)

$\text{(R,R)-2,3-butanediol}$ and $\text{(S,S)-2,3-butanediol}$

b)

$\text{(R)-2-butanol}$ and $\text{(S)-2-butanol}$

c)

$\text{Cis-2-butene}$ and $\text{Trans-2-butene}$

d)

$\text{Ethanol}$ and $\text{Dimethyl ether}$

24.

Which of the following is an example of a pair of conformational isomers?

a)

$\text{Eclipsed and staggered ethane}$

b)

$\text{Cis-2-butene}$ and $\text{Trans-2-butene}$

c)

$\text{Ethanol}$ and $\text{Dimethyl ether}$

d)

$\text{Propane}$ and $\text{Butane}$

25.

Which of the following is an example of a pair of structural isomers?

a)

$\text{Ethanol}$ and $\text{Dimethyl ether}$

b)

$\text{Cis-2-butene}$ and $\text{Trans-2-butene}$

c)

$\text{(R)-2-butanol}$ and $\text{(S)-2-butanol}$

d)

$\text{Propane}$ and $\text{Butane}$

Naming Isomers

Total questions: 25

Worksheet time: 25mins

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