11 markmedium
Menthol has a number of medicinal uses. It can be extracted from the peppermint plant. The structure of menthol is
How many chiral centres are there in one molecule of menthol?
Choose your answer
1
2
3
4
Chemistry
Organic Chemistry: Chirality — Multiple-Choice Questions (Edexcel IAL Chemistry): Exam Questions
Exam code:YCH119 questions · 9 marks · ≈ 9 min
21 markmedium
Citronellol is found in rose and geranium oils.
The type(s) of stereoisomerism shown by citronellol is
Choose your answer
optical and geometric isomerism
optical isomerism only
geometric isomerism only
neither optical nor geometric isomerism
31 markmedium
How many optical isomers does this molecule have?
Choose your answer
2
3
6
8
41 markmedium
The rate of a reaction between two reactants, A and B, was studied using the initial-rates method.
The results are shown in the table.
| Experiment | [A] / mol dm-3 | [B] / mol dm-3 | Initial rate / mol dm-3 s-1 |
|---|---|---|---|
| 1 | 0.40 | 0.40 | 1.28 × 10-2 |
| 2 | 0.20 | 0.40 | 6.4 × 10-3 |
| 3 | 0.20 | 0.20 | 1.6 × 10-3 |
What is the rate equation for this reaction?
Choose your answer
rate = k[A][B]
rate = k[A][B]2
rate = k[A]2[B]
rate = k[A]2[B]2
51 markmedium
Which of these molecules contains a chiral centre?
Choose your answer
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61 markhard
Which of these reactions does not result in the formation of a racemic mixture?
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but-2-ene with HCl
but-1-ene with HCl
propanal with HCN
propanone with HCN
71 markhard
When a single enantiomer of 2-iodobutane reacts with sodium hydroxide, the product is a mixture of enantiomers. This is because
Choose your answer
the reaction is a nucleophilic substitution
the reaction proceeds via a negatively charged transition state
the reaction proceeds via a carbocation intermediate
the reaction rate depends on the concentration of 2-iodobutane
81 markhard
A sample of a bromoalkane, RBr, containing a single optical isomer reacts with hydroxide ions in an SN1 mechanism.
RBr + OH− ROH + Br−
The alcohol formed is a racemic mixture.
From this information, it can be deduced that RBr is most likely to be
Choose your answer
primary only
secondary only
tertiary only
primary, secondary or tertiary
91 markhard
Which of these structures is not identical to the others?
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Structure A
Structure B
Structure C
Structure D