Ethanol can react to form ethene in the presence of concentrated sulfuric acid, H2SO4, at 300 ℃.
Which of the following descriptions is correct for the first mechanism arrow?
From :OH to H in H2SO4
From C-O bond to positively charged O atom
From H in H2SO4 to :OH
From H-C bond to C-C bond
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Which mechanism does not occur in the following reaction sequence?
Nucleophilic addition
Nucleophilic substitution
Nucleophilic addition elimination
Free radical substitution
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Which mechanism occurs when potassium cyanide, KCN, reacts with an aldehyde?
Nucleophilic substitution
Nucleophilic addition
Electrophilic substitution
Nucleophilic addition elimination
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Which mechanism occurs between phenylamine and chloroethane?
Electrophilic substitution
Free radical substitution
Nucleophilic addition elimination
Nucleophilic substitution
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Which of the arrows in the following mechanism is not correct?
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In the mechanism shown, which of the arrows is not correct?
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In the reaction scheme outlined, which mechanism occurs in Step 1?
Elimination
Nucleophilic addition
Nucleophilic substitution
Electrophilic addition
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Propanone can be used to form 2-hydroxy-2-methylpropanenitrile.
Which of the following descriptions is correct for the first two mechanism arrows?
| Arrow 1 | Arrow 2 |
A | From :OH- nucleophile to δ+ C atom | From δ- O atom bond to C=O atom |
B | From :CN- nucleophile to δ- C atom | From lone pair on O atom to H+ ion |
C | From :CN- nucleophile to δ+ C atom | From C=O bond to δ- O atom |
D | From :OH- nucleophile to δ- C atom | From δ- O atom bond to C=O atom |
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The products formed from the reaction between butan-1-ol with ethanoic anhydride are
Water and ethyl butanoate
Ethanoic acid and butyl ethanoate
Water and butyl ethanoate
Ethanoic acid and ethyl butanoate
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Which equation does not represent the formation of an electrophile?
CH3CH2Cl + AlCl3 → CH3CH3+ + AlCl4-
HNO3 + 2H2SO4 → NO2+ + H3O+ + 2HSO4-
CH3COCl + AlCl3 → CH3CO+ + AlCl4-
CH3Br + AlBr3 → CH3+ + AlBr4-
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Which alkene reacts with hydrogen chloride to give 2-chloro-3-methylpentane as the major product?
CH3CH2C(CH3)=CHCH3
CH3CH2CH2CH=CHCH3
CH3CH2C(CH3)=CH2
CH3CH2CH(CH3)CH=CH2
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Some compounds form racemic mixtures when potassium cyanide, KCN (aq), and dilute hydrochloric acid, HCl (aq), are added.
Which of the below will form a racemic mixture?
HCHO
(CH3)2CO
CH3CH2CHO
(C3H7)2CO
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The reaction between butanoyl chloride, CH3CH2CH2COCl, and benzene, C6H6, is an example of acylation.
Which of the following correctly demonstrates part of the reaction mechanism?
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A mixture of products are made when methylamine, CH3NH2, and chloroethane, CH3CH2Cl, react by nucleophilic substitution.
Which of the following is not a possible product?
C2H5NHCH3
(C2H5)2NCH3
[(C2H5)3NCH3]⁺Cl ⁻
[(C2H5)2N(CH3)2]⁺Cl ⁻
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4-methylphenylamine is formed during the following reaction scheme.
Which combination of reagents are required for each step?
| Step 1 | Step 2 |
A | Conc H2SO4 and conc HCl | Ni and H2, |
B | Conc H2SO4 and conc HNO3 | Sn and conc HCl |
C | Conc H2SO4 and conc HNO3 | NaBH4 and conc HCl |
D | Conc HNO3 and conc HCl | Sn and conc H2SO4, |
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