Aldehydes and Ketones
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Questions and Answers

What is the boiling point of liquid formaldehyde?

  • 400°C
  • 300°C
  • −21°C (correct)
  • −100°C
  • What is the main reason behind the solubility of formaldehyde in water?

  • The reaction with oxygen
  • The colourless nature of formaldehyde
  • The pungent smell of formaldehyde
  • Hydrogen bonding between water molecules and its hydrate (correct)
  • What is the name of the reaction that involves the reduction of acetyl chloride with hydrogen in the presence of a catalyst?

  • Rosenmund's reaction (correct)
  • Platinised asbestos reaction
  • Elecrical discharge reaction
  • Formaldehyde synthesis reaction
  • What is the use of the 40% solution of formaldehyde?

    <p>As a disinfectant, germicide and antiseptic</p> Signup and view all the answers

    What is the name of the compound that is prepared using formaldehyde and is used as an antiseptic and germicide?

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

    What is the reaction that involves the heating of a mixture of calcium acetate and calcium formate to produce formaldehyde?

    <p>Heating of calcium acetate and calcium formate</p> Signup and view all the answers

    What is the primary purpose of the Oxo process?

    <p>To prepare aldehydes</p> Signup and view all the answers

    What happens when two molecules of carboxylic acids react together?

    <p>A cross-aldol reaction occurs</p> Signup and view all the answers

    What catalyst is used in the Wacker process?

    <p>PdCl2</p> Signup and view all the answers

    What is the byproduct of the decarboxylation of formic acid?

    <p>Carbon dioxide and water</p> Signup and view all the answers

    What is the name of the process that converts alkynes to aldehydes?

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

    What is the purpose of using MnO in the decarboxylation of carboxylic acids?

    <p>To catalyze the reaction</p> Signup and view all the answers

    What is the physical state of benzophenone?

    <p>Colourless, pleasant smelling solid</p> Signup and view all the answers

    What is the reaction of benzophenone with potassium hydroxide?

    <p>It forms potassium benzoate and phenol</p> Signup and view all the answers

    What is one of the uses of benzophenone?

    <p>As a sleep-producing drug</p> Signup and view all the answers

    What is the product of the reaction of benzophenone with sodium amalgam?

    <p>Diphenyl carbinol</p> Signup and view all the answers

    How can benzophenone be prepared from alkyl benzenes?

    <p>By reacting with nitric acid and sulphuric acid</p> Signup and view all the answers

    What is not a characteristic property of the keto group exhibited by benzophenone?

    <p>It gives a bisulphite compound</p> Signup and view all the answers

    What is the nature of the product formed in the addition reaction catalysed by a base?

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

    Which type of ketones reacts with sodium bisulphite?

    <p>Aliphatic methyl ketones</p> Signup and view all the answers

    What is the driving force for the formation of a cyanohydrin?

    <p>Presence of a base catalyst</p> Signup and view all the answers

    What is the result of the addition reaction between an aldehyde and an alcohol in the presence of an acid catalyst?

    <p>Formation of a hemiacetal</p> Signup and view all the answers

    What is the optically active compound that can be formed through the cyanohydrin reaction?

    <p>Alpha-hydroxy acid</p> Signup and view all the answers

    What is the purpose of the addition reaction between a carbonyl compound and an alcohol?

    <p>To form a new compound with a hydroxyl group</p> Signup and view all the answers

    What is the main reason for the difference in reactivity between aldehydes and ketones in nucleophilic addition reactions?

    <p>The inductive effect of the alkyl group in ketones</p> Signup and view all the answers

    Why do ketones have slightly higher boiling points than their isomeric aldehydes?

    <p>Due to the presence of two electron-releasing groups around the carbonyl carbon</p> Signup and view all the answers

    What is the effect of the alkyl group on the reactivity of carbonyl compounds?

    <p>It decreases the positive charge on the carbonyl carbon</p> Signup and view all the answers

    What is the type of reaction that aldehydes and ketones readily undergo?

    <p>Nucleophilic addition reactions</p> Signup and view all the answers

    What is the effect of the positive charge on the carbonyl carbon on the reactivity of carbonyl compounds?

    <p>A higher positive charge increases the reactivity</p> Signup and view all the answers

    What is the reason for the higher reactivity of aldehydes compared to ketones?

    <p>The greater positive charge on the carbonyl carbon in aldehydes</p> Signup and view all the answers

    What is the primary condition for alkylation to occur with RX in the presence of a base?

    <p>The carbonyl compound should have at least one α-hydrogen atom</p> Signup and view all the answers

    What is the product of the aldol formation reaction?

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

    What is the role of the base in the alkylation reaction?

    <p>To facilitate the S N 2 reaction</p> Signup and view all the answers

    What is the result of hyper-conjugation in crotonaldehyde?

    <p>Formation of a conjugated alkene carbonyl compound</p> Signup and view all the answers

    What is the requirement for the organic compound used in the condensation reaction?

    <p>It should have an –I group</p> Signup and view all the answers

    What is the second step of the alkylation reaction?

    <p>Dehydration of the aldol</p> Signup and view all the answers

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