Organic Chemistry: Aldehyde Preparation Methods
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Questions and Answers

Which method uses Palladium on barium sulfate as a catalyst for the reduction process?

  • Reduction by DIBAL−H₂
  • Rosenmund Reduction (correct)
  • Stephen's Reduction
  • Etard Reaction

    • The Etard Reaction can convert benzyl alcohol directly to benzaldehyde.

    False

    What is the final product of the Rosenmund Reduction when starting with an acyl chloride?

    Aldehyde

    In Stephen's Reduction, the starting compound is a _____ (circonitry) connected to a nitrogen atom.

    <p>nitrile</p> Signup and view all the answers

    Match the following methods of aldehyde preparation with their chemical reactions:

    <p>Rosenmund Reduction = R−COCl → R−CHO Stephen's Reduction = R−C≡N + SnCl₂ + HCl Reduction by DIBAL−H₂ = R−CN → R−CHO Etard Reaction = C₆H₆O → C₆H₅−CHO</p> Signup and view all the answers

    What is the product formed when $C_6H_5 - CH_2 - Cl$ is oxidized?

    <p>Benzaldehyde</p> Signup and view all the answers

    The Gatterman Koch Reaction produces Benzaldehyde using Benzene, Carbon Monoxide, and Hydrochloric Acid.

    <p>True</p> Signup and view all the answers

    What reagent is used in the preparation of Ketones from Acid Chloride?

    <p>Grignard Reagents</p> Signup and view all the answers

    The reaction of $R - MgCl + R'CN$ leads to the formation of an intermediate known as ______.

    <p>Nitrile</p> Signup and view all the answers

    Match the following reactions with their corresponding products:

    <p>$C_6H_5 - CH_2 - Cl + O_2 o$ = Benzaldehyde $2R - MgCl + CdCl_2 o$ = R2Cd $R - MgCl + R'CN o$ = R - C ≡ N $C_6H_6 + CO + HCl o$ = Benzaldehyde</p> Signup and view all the answers

    What is the product of oxidizing a primary alcohol?

    <p>Aldehyde</p> Signup and view all the answers

    A tertiary alcohol can be oxidized to form a ketone.

    <p>False</p> Signup and view all the answers

    What is the significance of oxidative ozonolysis in carbonyl compound preparation?

    <p>It converts alkenes into carbonyl compounds.</p> Signup and view all the answers

    The reaction of R-C≡C-H with ext{Hg}^{2+}/ ext{H}2 ext{O} leads to the formation of R-C=CH2 and then R-C-_____.

    <p>CH3</p> Signup and view all the answers

    Match the reaction process with its product:

    <p>Oxidation of primary alcohol = Aldehyde Oxidation of secondary alcohol = Ketone Reductive ozonolysis = Carbonyl compound Kucherov Reaction = Alkene with OH group formation</p> Signup and view all the answers

    Which reactant is used to generate the acylium ion in Friedel-Crafts acylation?

    <p>CH3COCl</p> Signup and view all the answers

    In the Friedel-Crafts acylation, ketones are more reactive than aldehydes.

    <p>False</p> Signup and view all the answers

    What is produced when R-C(=O)-R' reacts with NaHSO3?

    <p>R-C(=O)-OH-SO3Na</p> Signup and view all the answers

    The reaction between CH3Cl and CCl4 produces two moles of __________.

    <p>CH3Cd</p> Signup and view all the answers

    Match the reagents to their corresponding reactions:

    <p>AlCl3 = Catalyst in Friedel-Crafts acylation HCN = Example of nucleophilic addition NaHSO3 = Reacts more readily with aldehydes CCl4 = Used in the reaction with CH3Cl</p> Signup and view all the answers

    What type of product is formed when a carbonyl group reacts with an alcohol?

    <p>Ether-like structure</p> Signup and view all the answers

    A Grignard reagent reacts with a carbonyl group to produce a ketone.

    <p>False</p> Signup and view all the answers

    What is produced when formaldehyde reacts with a Grignard reagent?

    <p>Primary alcohol</p> Signup and view all the answers

    The product formed when a carbonyl group reacts with hydroxyl amine is called an __________.

    <p>oxime</p> Signup and view all the answers

    Match the reagents with their corresponding products:

    <p>H = Imine OH = Oxime NH₂ = Hydrazone R = Schiff's base PhNH₂ = Phenylhydrazone</p> Signup and view all the answers

    Which reagents can be used to reduce a carbonyl compound to an alcohol?

    <p>Both A and C</p> Signup and view all the answers

    The reduction of a carbonyl compound using Zn(Hg)/conc HCl produces an alcohol.

    <p>False</p> Signup and view all the answers

    What is the product formed when lithium aluminum hydride (LAH) is used to reduce a carbonyl compound?

    <p>Alcohol</p> Signup and view all the answers

    The Mozingo reduction involves the conversion of Ph-CHO to Ph-______ using specific reagents.

    <p>CH3</p> Signup and view all the answers

    Match the following reduction methods with their products:

    <p>LAH = Alcohol Zn(Hg)/conc HCl = Alkane NH₂–NH₂/ethylene glycol = Alkane HS/H₂/H⁺ = Alcohol</p> Signup and view all the answers

    What forms on the inside of the reaction vessel during a positive Tollen's test result?

    <p>A silver mirror</p> Signup and view all the answers

    A Tollen's test can yield a positive result for ketones.

    <p>False</p> Signup and view all the answers

    What are the two components mixed to prepare Tollen's reagent?

    <p>silver nitrate and ammonia</p> Signup and view all the answers

    A positive Tollen's test indicates the presence of an __________ group.

    <p>aldehyde</p> Signup and view all the answers

    Match the following results with their corresponding compounds:

    <p>Aldehyde = Positive result (silver mirror) Ketone = Negative result (no silver mirror)</p> Signup and view all the answers

    Which of the following carbonyl compounds can be oxidized to form carboxylic acids?

    <p>Aliphatic aldehyde</p> Signup and view all the answers

    Popoff's Rule states that the C=O of symmetrical ketones always stays on the same side during oxidation.

    <p>False</p> Signup and view all the answers

    What is the general product when an aldehyde is oxidized?

    <p>Carboxylic acid</p> Signup and view all the answers

    The oxidation of unsymmetrical ketones always results in the carboxylic acid from the side where the ______ alkyl group is present.

    <p>smaller</p> Signup and view all the answers

    Match the following reagents with the type of carbonyl compound they can oxidize:

    <p>KMnO4/H+ = Aldehydes and Ketones K2Cr2O7/H+ = Aldehydes Conc HNO3 = Aldehydes H2O2 = Ketones</p> Signup and view all the answers

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