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Questions and Answers
In a free radical reaction, free radicals are formed at?
Which of the following dienes can undergo the Diels–Alder reaction most readily?
Separating techniques such as gas chromatography and liquid chromatography are not appropriate for separation of amino acids. Select the correct reason from the following.
When trans-2-butene is treated with bromine, an anti-addition of bromine yields meso-2,3-dibromobutane. Select the correct statement regarding the reaction.
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Reduction of imines to give amines in protic solvents can be carried out by one of the following reagents. Select the correct reagent.
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In the reaction of 2-nitrotoluene with bromine in the presence of iron, which of the products shown below is the most abundant (major) product?
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Which of the following cannot react as a nucleophile?
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Which of the following compounds will be oxidized by CrO3 in acid?
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Which of the following compounds absorbs at the longest wavelength?
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Which of the following reagents will reduce a disubstituted alkyne to trans-alkene?
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Which of the following statements is true about the following reaction?
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Which functional group is present in the molecule shown below?
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Study Notes
Free Radical Reactions
- Free radicals are formed during the initiation and propagation steps of a free radical reaction.
Diels-Alder Reaction
- Diene structures with more conjugated double bonds readily undergo Diels-Alder reactions.
Separating Techniques for Amino Acids
- Gas chromatography and liquid chromatography are not suitable for separating amino acids due to their high polarity.
Stereochemistry of Reactions
- Trans-2-butene reacting with bromine results in an anti-addition, yielding meso-2,3-dibromobutane.
- This reaction is both stereoselective and stereospecific.
Imine Reduction
- Sodium cyanoborohydride is the preferred reagent for reducing imines to amines in protic solvents.
Electrophilic Aromatic Substitution
- Bromination of 2-nitrotoluene in the presence of iron will primarily yield the product with bromine substituting at the position ortho to the nitro group.
Nucleophiles
- Quaternary ammonium ions ((CH3)4N+) cannot act as nucleophiles due to the positive charge on the nitrogen atom, which repels electrons.
Oxidation Reactions
- CrO3 in acid can oxidize compounds containing secondary alcohols, like 2-methylcyclohexanone.
UV-Vis Spectroscopy
- Conjugated systems with longer chains of alternating double and single bonds absorb at longer wavelengths.
Alkyne Reduction
- Treating a disubstituted alkyne with sodium in liquid ammonia (Na/NH3) yields a trans-alkene.
SN2 Reactions
- The SN2 reaction of an alcohol with a chloride will lead to an inversion of configuration, potentially creating a chiral center in the product.
Functional Groups
- The provided molecule contains an amide functional group identified by the presence of the carbonyl group directly bonded to a nitrogen atom.
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Description
Test your knowledge on various organic chemistry reactions, including free radical reactions, Diels-Alder reactions, and stereochemistry. This quiz covers key concepts like separation techniques for amino acids, imine reduction, and electrophilic aromatic substitution. Perfect for students studying organic chemistry at an advanced level.
