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WorksheetsMock Test-3
Total questions: 60
Worksheet time: 3600secs
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
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 compounds is the enantiomer of the above compound?
All of them.
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
In a stereoisomer, ________ means "on the same side" and ______ means "across from."
cis; trans
cis; L
D; L
trans; cis
Which of the following compounds is the enantiomer of the above compound?
All of the above
Compounds with different functional group but similar molecular formula can have _____________ group isomers.
chain
position
functional
optical
Diagram represents the structural formula of a carbon compound.
Which of the following alcohol reacts with propanoic acid to produce the above compound?
CH3OH
CH3CH2OH
CH3CH2CH2OH
CH3CH2CH2CH2OH
Diagram shows oxidation process of ethanol.
What can be observed after being heated for 5 minutes?
No colour change
All of the ethanol vapourises and the flask becomes dry
The colour of mixture changes from orange to green
The mixture in the flask separated into two layers. The upper layer is yellow while the lower layer is green
When liquid R is refluxed with propanoic acid and a few drops of concentrated sulphuric acid, a sweet smelling liquid is formed. Liquid R may be
propanol
ethanoic acid
hexane
ethyl propanoate
A structural isomer of pentane is?
2-methyl butane
2,2-dimethyl octane
1-methyl propane
1-methyl 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
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
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
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 two is more stable ?
Equatorial
Axial
Both are equal
Identify the conformation
Boat
Chair
twist boat
half chair
Most stable conformation of cyclohexane is
chair
boat
twist boat
half chair
The most unstable conformer in cyclohexane?
Boat
Chair
Twist boat
half chair
In a stereoisomer, ________ means "on the same side" and ______ means "across from."
cis; trans
cis; L
D; L
trans; cis
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
A molecule that contains C=C must exist cis-trans isomerism
FALSE
TRUE
What is E-Z isomerism?
An E isomer is where molecules with atoms or groups on opposite sides.
E-Z isomerism is another way of naming structural isomers.
A Z isomer is where molecules with atom or groups are on the same side.
An example of chain 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
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
Which statement best defines chain isomerism?
Existance of chemical compounds with same molecular formula
Different ways the same number of carbons are connected which is either straight or branched
Have mirror image of each other
Similar chemical properties with different physical properties such as solubility
Which substance is made up of amino acids?
Fats
Pepsin
Urea
Glycogen
Starch and cellulose are substances that are made up of many units of
fatty acids.
glycerol.
monosaccharides.
amino acids.
Which type of carbohydrate is found in large quantities in the liver?
Starch
Glucose
Sucrose
Glycogen
The diagram shows the mechanism of enzyme action.
What does P represent?
Enzyme
Substrate
Enzyme-substrate complex
Products of the reaction
Lactose is made of
two fructose molecules.
two glucose molecules.
one glucose molecule and one fructose molecule.
one glucose molecule and one galactose molecule.
A triglyceride molecule is made up of
amino acids.
three glucose molecules
one molecule of glycerol and three molecules of fatty acids.
three glycerol molecules.
Proteins are made up of basic units or monomers called
monosaccharides.
amino acids.
nucleotides.
glycerol.
Excess amino acids cannot be stored in the body. They are broken down by a process known as
hydrolysis.
reduction.
deamination.
decomposition.
In the reaction:
Maltose + water ---> glucose + glucose. What is the enzyme involved in this reaction?
Maltase
Pepsin
Lipase
Catalase
The graph shows the effect of temperature on the activity of enzyme X.
The enzyme will be denatured at
below 0oC
between 0oC to 10oC
between 40oC to 50oC
above 60oC
The enzyme rennin is used in industry
to
coagulate milk proteins
coagulate yoghurt.
concentrate cheese.
ripen cheese.
The specificity of an enzyme is due to
the bond between the enzyme molecules.
the presence of certain ions on the surface of the enzyme.
the configuration of the enzyme molecules.
the presence of a co-factor.
Phenol is stronger acid than water and itself it is
weakly acidic
weakly basic
alkali
strong acid
Phenols are more acidic than alcohols because
Phenoxide ion is stablised by resonance
Phenols are more soluble in polar solvents
Phenoxide ion does not exhibit resonance
Alcohols do not lose H atoms at all
Phenol is stronger acid than water and itself it is
weakly acidic
weakly basic
alkali
strong acid
Name the following
2,4,6-Trinitrotoluene
Trinitro benzene
1,3,5-Trinitrotoluene
How do you find this quiz?
What is K ?
The image highlights a sulfur and hydrogen bonded to an amino acid. What answer choice best describes this highlighted group?
carbonyl group
carboxyl group
sulfhydyl group
hydroxyl group
methyl group
