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WorksheetsISOMERISM
Total questions: 150
Worksheet time: 3hrs 30mins
Isomerism that arises out of the difference in spatial arrangement of atoms or groups about the doubly bonded carbon atoms are called?
Structural Isomerism
Stereoisomerism
Geometrical Isomerism
Optical Isomerism
How to determine that a molecule exhibit cis-trans isomerism?
Restricted rotation in a carbon-carbon single bond of alkenes
Each carbon of a site of restricted rotation has 2 different atoms or groups attached to it
Exist in cyclic compouds only
Similar chemical properties
Two optical isomers have the same
Empirical formula
Structural formula
Molecular formula
Butan-1-ol and Butan-2-ol exhibit (a) isomerism
Isomerism exhibited by acetic acid and methyl formate is
position
chain
functional
metamerism
Which of the following compound(s) exhibit(s) cis-trans isomerism?
(1) 1,2-dibromo-1,2-dichloroethene
(2) 3,3-dibromo-2-chloropropene
(3) 1,2-dichloropropene
(1) only
(2) only
(1) and (3) only
(2) and (3) only
Which of the following compounds exhibits stereoisomerism?
Butanal
Propenoic acid
1-bromohexane
3,4-dichloropent-1-ene
Which of the following compounds is the enantiomer of the above compound?
All of them.
Choose the incorrect option regarding isomerism:
They differ in both physical and chemical properties
They have different molecular formula
There are two types of isomerism : Structural and Stereoisomerism
Geometric and optical isomerism are two types of stereoisomerism
What is a functional group?
Atoms or group of atoms that give specific characteristics to a molecule
Group of molecules that make up a group of atoms
Group of molecules that give specific characteristics to an atom
Group of atoms that give specific characteristics to an element
Classify the compound based on the functional group present.
Ketone
Carboxylic acid
Ester
Ether
A molecule that contains C=C must exist cis-trans isomerism
FALSE
TRUE
the molecule contains cis-trans isomerism because the C=C double bond is restricted to rotation
TRUE
FALSE
Fill in the blanks to Define chiral centre:
A ______ atom bonded with _______ different groups
carbon , four
hydrogen, two
oxygen , four
oxygen, two
Compounds that are composed of the same number and type of atoms but have them arranged in different ways are ___________.
isomers
isotopes
polymers
alkanes
In a stereoisomer, ________ means "on the same side" and ______ means "across from."
cis; trans
cis; L
D; L
trans; cis
The two Geometric isomers shown are called:
Cis/trans 1,2 dichloroethane
Cis/trans 1,2 dichloroethene
Cis/trans 1,2 chloroethane
Cis/trans 1,2 chloroethene
A structural isomer of pentane is?
2-methyl butane
2,2-dimethyl octane
1-methyl propane
1-methyl pentane
Explain why hexane exhibits cis-trans isomerism
There is restriction in the rotation of carbon-carbon double bond.
Have same atom or group in the same side.
No mirror image
There is restriction in the rotation of carbon-carbon single bond in cyclic structure.
Propene mempunyai 2 isomer
Ikatan ganda dua pada molekul butana diubah dari C1 ke C2. struktur baru yang terhasil ialah isomer
Manakah antara berikut ialah isomer bagi propena?
isomer bagi butena ialah 1-butena, 2-butena dan ....
pentena mempunyai ........ isomer
The molecular formula C5H12 contains how many isomeric alkanes?
1
2
3
4
Which of the following are isomers of butene ?
I, III
II, IV
I,II, III
I, II, IV
Define chirality centre
also known as chiral carbon
a type of enantiomer
a sp3 hybridised carbon with four different groups or atoms attached to it
optically active compounds
Can enantiomer rotates plane-polarised light?
Yes in all situations
No because it is optically active
Yes but it can only rotate the polarised light in opposite direction
No due to its restricted rotation of carbon-carbon double bond
Can 2-cyanopentane exists as a pair of enantiomers?
Yes,because it is a electrophlie.
No,it is not an optical isomer.
Yes,because it contains a chiral carbon bonded to four different atoms or groups.
Explain why hexane exhibits cis-trans isomerism
There is restriction in the rotation of carbon-carbon double bond.
Have same atom or group in the same side.
No mirror image
There is restriction in the rotation of carbon-carbon single bond in cyclic structure.
Classify the following pair of molecules which are diastromers
Is it true that enantiomer have the same physical and chemical properties?
Yes
False
State the possible type of stereoisomerism shown by 2-hydroxy-3-pentane
Diastromer
Enantiomer
Both
Which one of the following will exhibit conformational isomerism?
Ethylene
methane
chloromethane
propane
Most stable conformation of cyclohexane is
chair
boat
twist boat
half chair
The energy barrier for rotation of C-C bond in ethane is
4 kcal/mol
5 kcal/mol
3 kcal/mol
2 kcal/mol
Which of the following compound has gauche as it stable conformer?
n-butane
n-propane
1,2-dicloroethane
1,2-dihydroxyethane
Which of the following shows syn /anti isomerism?
azo compounds
oximes
hydrazines
amines
Which of the two is more stable ?
Equatorial
Axial
Both are equal
The most unstable conformer in cyclohexane?
Boat
Chair
Twist boat
half chair
Which of the following conformers is not a transition state?
Boat
half chair
fully eclipsed
twist boat
Which other factor along with torsion decide the stability of conformer?
Intermolecular hydrogen bonding
Intramolecular hydrogen bonding
coordinate bonding
ionic bonding
Identify the conformation
Boat
Chair
twist boat
half chair
Define chirality centre
also known as chiral carbon
a type of enantiomer
a sp3 hybridised carbon with four different groups or atoms attached to it
optically active compounds
Refer to the following compound:
How many cis-trans isomers and chiral carbon(s) are there for the compound?
cis-trans isomers : 0 chiral carbon : 1
cis-trans isomers : 2 chiral carbon : 2
cis-trans isomers : 0 chiral carbon : 2
cis-trans isomers : 2 chiral carbon : 1
Refer to the following compound:
Which of the following statements about the compound is INCORRECT?
Its systematic name is 2-chloro-1-fluorobutane.
It consists of polar molecules.
It is soluble in water.
It exhibits enantiomerism.
Which of the following pairs of molecules are NOT structural isomers?
Prop-1-en-1-ol and prop-1-en-2-ol
Pentanoic acid and methyl propanoate
Butanoic acid and methylpropanoic acid
Cis-pent-2-ene and trans-pent-2-ene
Questions 4 and 5 refer to compound A, which has the following structure:
Which of the following statements about compound A are correct?
(1) Its systematic name is pent-2-enedioic acid.
(2) It is soluble in water.
(3) The molecules of A are held together by hydrogen bonds only.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Compound B has the following structure:
Which of the following statements is INCORRECT?
Compound A and compound B are a pair of cis-trans isomers.
Compound A has a higher boiling point than compound B.
Compound A has a higher melting point than compound B.
Compound A and compound B have similar chemical properties.
The following diagram shows the structure of a type of penicillin:
How many chiral carbons are there in the penicillin molecule?
3
4
5
6
Which of the following compounds exhibits enantiomerism but not cis-trans isomerism?
Which of the following pairs of compounds is/are identical?
(1) only
(2) only
(1) and (3) only
(2) and (3) only
Compounds X, Y and Z have the same molecular formula C4H10O. Their structures are shown below:
a. State the type of isomerism between
(i) X and Y; (1 mark)
(ii) Y and Z. (1 mark)
b. Arrange the three isomers in descending order of boiling points. Explain your answer. (3 marks)
c. One of the isomers exhibits optical isomerism. Draw the structures of the optical isomers. (2 marks)
Compounds that are composed of the same number and type of atoms but have them arranged in different ways are ___________.
isomers
isotopes
polymers
alkanes
What property can be assigned to a carbon atom that has four different atoms or structural groups attached to it?
isomerity
chirality
chivalry
geometry
Chiral carbons will produce _____________.
structural isomers
optical isomers
polymers
monomers
In a stereoisomer, ________ means "on the same side" and ______ means "across from."
cis; trans
cis; L
D; L
trans; cis
圖中該對分子是
The two compounds are
對映異構體。
enantiomers.
結構異構體。
structural isomers.
相同的。
the same.
順-反異構體。
cis-trans isomers.
一個化合物在其碳-碳雙鍵的每個碳原子上有多少個不同的原子或基團能展現順-反結構?
How many different atoms or groups on each carbon atom of the carbon-carbon double bond in a compound can satisify to exhibit cis-trans isomerism ?
1
2
3
4
丁-1-醇和丁-2-醇是
Butan-1-ol and butan-2-ol are
順-反異構體。
cis-trans isomers.
對映異構體。
enantiomers.
鏈異構體。
chain isomers.
位置異構體。
position isomers.
圖中哪對是順-反異構體?
Which of the following pairs are cis-trans isomers?
W 和 X
W and X
W 和 Y
W and Y
X 和 Z
X and Z
Y 和 Z
Y and Z
下列哪種烯能展現順-反異構?
Which of the following alkenes can exhibit cis-trans
isomerism?
CH3CH=CHCH2CH3
CH3CH2CH2CH=CH2
(CH3)2C=CHCH3
C2H5(CH3)C=C(CH3)2
下列哪種烯能展現順-反異構?
Which of the following alkenes can exhibit cis-trans
isomerism?
CH3CH=CHCH2CH3
CH3CH2CH2CH=CH2
(CH3)2C=CHCH3
C2H5(CH3)C=C(CH3)2
一個化合物能符合展現順-反異構的其中一項條件是它含____________。
One of the conditions to satisfy a compound to exhibit cis-trans isomerism is that it contains a _________________.
(a)
這對分子是 __________ 立體異構。
The two compounds are __________ stereoisomerism.
(a)
How many structural isomers with an unbranched carbon chain have the molecular formula C4H8Br2?
4
5
6
7
How many structural isomers are there with the molecular formula C3H6BrCl?
4
5
6
7
Which is a pair of functional group isomers?
How many isomers have the molecular formula C5H12?
2
3
4
5
Which one of the following is a pair of functional group isomers?
CH3COOCH2CH3 and CH3CH2COOCH3
(CH3)2CHCH(CH3)2 and (CH3)3CCH2CH3
CH3CH2OCH3 and (CH3)2CHOH
ClCH2CH2CH=CH2 and CH3CH=CHCH2Cl
How many structural isomers, which are aldehydes, have the molecular formula C5H10O?
2
3
4
5
How many structural isomers, which are esters, have the molecular formula C4H8O2?
2
3
4
5
The number of structural isomers of molecular formula C4H9Br is
5
4
3
2
Which statement best defines chain isomerism?
Existance of chemical compounds with different functional group
structural formula that has different location of substituent group
Different ways the same number of carbons are connected which is either straight or branched
Similar chemical properties with different physical properties such as solubility
Define Isomerism.
Propane has no structural isomers
True
False
Which formulas represent butane or its isomer?
(1) CH3(CH2)2CH3
(2) CH3CH(CH3)CH3
(3) (CH3)3CH
1 and 2 only
1 and 3 only
2 and 3 only
1 , 2 and 3
Which structural formula represents an isomer?
A structural isomer of pentane is?
2-methyl butane
2,2-dimethyl octane
1-methyl propane
1-methyl pentane
Which structural formula represents a molecule that is not an isomer of pentane?
Which of the following are isomers of butene ?
I, III
II, IV
I,II, III
I, II, IV
The molecular formula C5H12 contains how many isomeric alkanes?
1
2
3
4
Methylpropene is a isomer of ......
Butene
Pentene
Propene
Hexene
Which of these indicates the correct way of numbering of the carbon chains?
Which statement best defines chain isomerism?
Existance of chemical compounds with different functional group
structural formula that has different location of substituent group
Different ways the same number of carbons are connected which is either straight or branched
Similar chemical properties with different physical properties such as solubility
All of the following are chain isomers of each other, except one. Which is the exception?
Which molecules can show geometrical (E/Z) isomerism?
A and B
C and D
A, B and C
All of them
Which molecules can show geometrical (E/Z) isomerism?
A and B
C and D
A, B and C
All of them
Identify which of the following molecules are structural isomers.
Isomers have same ................ but different .................. properties
Chemical, Physical
Physical, Chemical
Which structural formula represents a molecule that is not an isomer of pentane?
Molecules of 1-bromopropane and 2-bromopropane differ in
molecular formula
structural formula
number of carbon atoms per molecule
number of bromine atoms per molecule
Compounds that are composed of the same number and type of atoms but have them arranged in different ways are ___________.
isomers
isotopes
polymers
alkanes
Structural isomers have
same molecular formula
different physical and chemical properties.
Have the same number of elements and atoms
all of the above
A structural isomer of pentane is?
2-methyl butane
2,2-dimethyl octane
1-methyl propane
1-methyl pentane
Which formulas represent butane or its isomer?
(1) CH3(CH2)2CH3
(2) CH3CH(CH3)CH3
(3) (CH3)3CH
1 and 2 only
1 and 3 only
2 and 3 only
1 , 2 and 3
Which formulas represent butane or its isomer?
(1) CH3(CH2)2CH3
(2) CH3CH(CH3)CH3
(3) (CH3)3CH
1 and 2 only
1 and 3 only
2 and 3 only
1 , 2 and 3
Look at the skeletal formulae of four molecules. Which of these molecules is chiral?
A
B
C
D
Which statement is true of the optical isomers of lactic acid?: CH3CHOHCOOH
Rotate the plane of plane-polarised light in opposite directions
They differ in their solubilities in water
They react at different rates with PCl5
They both occur naturally in muscles during exercise
How many chiral centres are there in this molecule? HOCH2CH(OH)CH(OH)CH(OH)CH(OH)CHO
2
4
5
6
Which one of the following can exhibit both geometrical and optical isomerism?
(CH3)2C=CHCH(CH3)CH2CH3
CH3CH2CH=CHCH(CH3)CH2CH3
(CH3)2C=C(CH2CH3)2
CH3CH2CH(CH3)CH(CH3)C=CH2
types of stereo-isomerism are optical isomerism and
cis-isomerism
trans-isomerism
cis-trans isomerism
all of them
Which type of isomerism does it have?
Geometrical isomerism
Functional Group isomerism
Optical isomerism
Structural isomerism
Compounds that are composed of the same number and type of atoms but have them arranged in different ways are ___________.
isomers
isotopes
polymers
alkanes
What property can be assigned to a carbon atom that has four different atoms or structural groups attached to it?
isomerity
chirality
chivalry
geometry
Chiral carbons will produce _____________.
structural isomers
optical isomers
polymers
monomers
What operation would transform 2,2 dimethylbutane into hexane?
Adding one carbon and three hydrogen atoms.
Moving a methyl group to the other end of the molecule.
Moving both methyl groups, one to each end of the molecule
Rotating the molecule.
In a stereoisomer, ________ means "on the same side" and ______ means "across from."
cis; trans
cis; L
D; L
trans; cis
How many structural isomers exist for hexane
three
two
five
four
There are two main forms of isomerism, which are?
Structural isomerism and Stereoisomerism
Stereoisomerism and Physical isomerism
Chemical isomerism and Stereoisomerism
Structural isomers and Geometric Isomers
A structural isomer of pentane is?
2,2-dimethyl butane
2-methyl butane
1-methyl propane
1-methyl pentane
Does this compound show optical isomerism?
Yes
No
Fischer Projection formula is generally used
a. For determining the various conformations of a molecule
b. To represent the molecules containing chiral centre/s
c. Both a & b
d. None
Two isomers having same molecular formula but different functional group exhibit
(a)
Geometrical isomerism is not shown by
a. 2-Butene
b. 1-Butene
c. 2-chloro-2-butene
d. 1,2-dibromocyclohexane
Two isomers having same molecular formula but different functional group exhibit
(a)
How to determine that a molecule exhibit cis-trans isomerism?
Restricted rotation in a carbon-carbon single bond of alkenes
Each carbon of a site of restricted rotation has 2 different atoms or groups attached to it
Exist in cyclic compouds only
Similar chemical properties
How to determine that a molecule exhibit cis-trans isomerism?
Restricted rotation in a carbon-carbon single bond of alkenes
Each carbon of a site of restricted rotation has 2 different atoms or groups attached to it
Exist in cyclic compouds only
Similar chemical properties
How to determine that a molecule exhibit cis-trans isomerism?
Restricted rotation in a carbon-carbon single bond of alkenes
Each carbon of a site of restricted rotation has 2 different atoms or groups attached to it
Exist in cyclic compouds only
Similar chemical properties
Isomerism exhibited by acetic acid and methyl formate is
position
chain
functional
metamerism
Restriction of rotation about the c=c is responsible for
Geometrical isomerism
Stereoisomerism
Metamerism
All
In absolute method functional group in cis isomer located cis to each other can be converted to
Cyclic lactones
Anhydrides
Amides
All
By using method of cyclization cis form of maleic acid form
Maleic anhydride
Fumaric acid
Tartaric acid
Lactic acid
The energy required to rotate the ethane molecule about c_c bond is called
Torsional energy
Angle strain
Hydrogen bonding
All
Which is a pair of functional group isomers?
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
Does this molecule exhibit optical isomerism?
Yes
No
