Exam code: H432
Which statement about optical isomers is correct?
Four different atoms or groups of atoms around a carbon atom cause 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
Optical isomers are molecules that have the same structural formula but have the atoms arranged differently in space
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Which carbon atom is the chiral centre in 4-amino-1,3-dichlorobutan-2-one, shown below?
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Which compound contains a chiral carbon?
Butanone
Butan-2-ol
Cyclopentanol
Propanal
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Which compound does not contain a chiral carbon?
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Some transition metal complexes show optical isomerism, depending on their geometry and the type of ligands they contain.
Which complex will not exhibit optical isomerism?
An octahedral complex with six identical monodentate ligands
An octahedral complex with three identical bidentate ligands
A tetrahedral complex with four different monodentate ligands
An octahedral complex with two different bidentate ligands
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Which statement about optical isomerism is correct?
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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Which statement about 2,3-dihydroxybutanedioic acid, shown below, is correct?
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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Which organic compound will produce optical isomers when it undergoes reduction?
CH3COCH3
CH3CH=CH2
CH3CH2COCH3
CH3CH2COOH
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The structure of ibuprofen is shown below.
How many chiral centres are present in an ibuprofen molecule?
1
2
3
4
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Ethanal reacts with hydrogen cyanide followed by hydrochloric acid to make 2-hydroxypropanoic acid in the two-step reaction sequence below.
Which row describes the reactants and products of each step?
| Reactant | Product of step 1 | Product of step 2 |
|---|---|---|---|
A | Optically active | Optically active | Optically active |
B | Optically inactive | Mixture of optical isomers | Mixture of optical isomers |
C | Optically active | Optically inactive | Optically active |
D | Optically active | Mixture of optical isomers | Mixture of optical isomers |
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Which compound forms a reduction product capable of exhibiting optical isomerism?
CH3CH2CH2COCH3
CH(CH3)2CH2CHO
C(CH3)3CHO
CH3CH2COCH2CH3
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Arthrinin-F, shown below, is a relatively novel compound isolated from fungus.
How many chiral centres are present in an Arthrinin-F molecule?
4
6
11
14
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Which statement about but-1-en-3-ol, CH2CHCHOHCH3, is not correct?
It has E/Z isomers
It will turn an acidified potassium dichromate(VI) solution green
It contains a peak at 1650 cm−1 on its IR spectrum
It has optical isomers
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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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Which compound forms a stereoisomeric product when reduced?
CH3CH2CH2=CHCH3
CH3CH2CH2CH2CHO
CH3CH2C(CH3)=CHCH3
CH3CH2CH2COCH3
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