Which statement is the most correct for an optical isomer?
Optical isomers are molecules that have the same structural formula but have the atoms arranged differently in space
Four different atoms or groups of atoms around a carbon atom causes optical isomerism
Optical isomerism occurs as a result of restricted rotation about a carbon–carbon double bond
Optical isomers are superimposable mirror images of each other called enantiomers
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Which carbon atom is the chiral centre in the following molecule?
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Which compound contains a chiral carbon?
Propanal
Butanone
Butan-2-ol
Cyclopentanol
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Which compound does not contain a chiral carbon?
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Which of the following can form a racemic mixture?
The product of but-1-ene and chlorine
The major product of propene and hydrogen chloride
The minor product of but-1-ene and hydrogen bromide
The product of ethene and bromine
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Which statement is true about optical isomerism?
Optical isomers have a different arrangement of carbon atoms in the skeleton of the molecule
Optical isomers have a different boiling point
Optical isomers have the same structural formula
Optical isomers have four different atoms attached to the chiral carbon
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The molecule shown below is called 2,3-dihydroxybutanedioic acid
What can be deduced from the structure?
There are four asymmetric carbon atoms
The structure shown rotates plane polarised light to the right
2,3-dihydroxybutanedioic acid is a racemate
The molecule has two chiral centres
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Ethanal reacts with hydrogen cyanide followed by hydrochloric acid to make 2-hydroxypropanoic acid in a two-step reaction sequence:
Which row is true?
| Reactant | Product of step 1 | Product of step 2 |
A | optically active | optically active | optically active |
B | optically inactive | racemate | racemate |
C | optically active | optically inactive | optically active |
D | optically active | racemate | racemate |
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Which of the following compounds will produce optical isomers when it undergoes reduction?
CH3COCH3
CH3CH=CH2
CH3CH2COCH3
CH3CH2COOH
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Which of the following reactions produces a racemate?
CH3CH2COCH3 + HCN
CH3CH2CBrCH2 + Br2
CH3CH2CHBrCH3 + NaOH
CH3CH2CH2CH2OH + H2SO4
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Which of the following reaction mixtures forms a racemate when the chemicals react?
2-hydroxy-2-methylpropanal with acidified potassium dichromate(VI) solution
Ethanol with methanoic acid
But-1-ene with bromine water
2-hydroxy-2-methylpropanal with sodium tetrahydridoborate(III) solution
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Which compound forms a reduction product capable of exhibiting optical isomerism?
CH3CH2COCH2CH3
CH3CH2CH2COCH3
CH(CH3)2CH2CHO
C(CH3)3CHO
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Arthrinin-F is a relatively novel compound isolated from fungus.
How many chiral centres does Arthrinin-F have in its structure?
4
6
11
14
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Which one of the following statements about but-3-en-2-ol, CH2CHCHOHCH3, is not true?
It has optical isomers
It has stereoisomers
It will turn an acidified potassium dichromate(VI) solution green
It shows a strong absorption in the infra-red at about 1650 cm−1
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N,N-Dimethyl-2-hydroxy-3-methylbutanamide can exist as a pair of optical isomers.
Which is the correct structure for an N,N-dimethyl-2-hydroxy-3-methylbutanamide enantiomer?
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