Aldehydes and Ketones
30 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following reactions involves the conversion of a carbonyl group to a imine?

  • Reductive amination (correct)
  • Nucleophilic addition
  • Electrophilic addition
  • Grignard reaction

What is the product of the reduction of ketones by Mg or Mg/Hg?

  • Vic cis diol (correct)
  • Aldehydes
  • Alkanes
  • Vic trans diol

Why are α-hydrogen atoms in carbonyl compounds acidic?

  • Due to the presence of an electron-donating group
  • Due to the presence of a methyl group
  • Due to the presence of an electron-withdrawing group (correct)
  • Due to the presence of a hydroxyl group

What is the product of the reduction of benzaldehyde by Na/C2H5OH?

<p>Vic cis diol (A)</p> Signup and view all the answers

Why are compounds with active methylene or methyne groups more acidic than simple aldehydes and ketones?

<p>Due to the increased stability of the conjugate base (B)</p> Signup and view all the answers

What is the product formed when acetaldehyde reacts with HCN?

<p>acetaldehyde cyanohydrin (A)</p> Signup and view all the answers

Which reagent is used to form isopropyl alcohol?

<p>CH3MgI (C)</p> Signup and view all the answers

What is the product formed when acetone reacts with NaHSO3?

<p>acetone sulfate (D)</p> Signup and view all the answers

What is the product formed when acetaldehyde reacts with hydroxylamine (NH2OH)?

<p>acetaldehyde oxime (D)</p> Signup and view all the answers

What is the product formed when acetone reacts with PCl5?

<p>isopropylidene chloride (B)</p> Signup and view all the answers

In a nucleophilic addition reaction, what happens when the attacking atom of the nucleophile has a lone pair of electrons in the addition product?

<p>Water is eliminated from the addition product (D)</p> Signup and view all the answers

What is the product formed when a primary amine or a derivative of ammonia reacts with a carbonyl compound?

<p>An imine (A)</p> Signup and view all the answers

Why is glycol often used in a reaction to protect a carbonyl group?

<p>Because it can be easily deprotected by hydrolysis (C)</p> Signup and view all the answers

What is the condition for obtaining high yields of acetals or ketals?

<p>Removal of water as it is formed (A)</p> Signup and view all the answers

What happens to acetals and ketals in the presence of excess water?

<p>They are transformed back to the corresponding aldehyde or ketone (A)</p> Signup and view all the answers

What is the significance of using NaCN in the reaction of aldehydes and ketones with HCN?

<p>To generate hydrogen cyanide in situ during the reaction (B)</p> Signup and view all the answers

Which of the following aldehydes does not give an optically active cyanohydrin?

<p>Formaldehyde (D)</p> Signup and view all the answers

What is the purpose of adding HCl to a mixture of a carbonyl compound and NaCN?

<p>To generate hydrogen cyanide in situ during the reaction (C)</p> Signup and view all the answers

Which of the following compounds can be separated from a mixture using NaHSO3?

<p>Aldehydes and aliphatic methyl ketones (D)</p> Signup and view all the answers

What is the characteristic of the product formed when a carbonyl compound reacts with HCN?

<p>It is a racemic mixture (A)</p> Signup and view all the answers

What is the characteristic of the carbonyl group that makes it polar?

<p>The oxygen atom attains a partial negative charge and the carbon atom attains a partial positive charge (D)</p> Signup and view all the answers

What is the name of the reaction that involves the oxidation of secondary alcohols to ketones by aluminium tert-butoxide?

<p>Oppenauer oxidation (D)</p> Signup and view all the answers

Which of the following reagents is NOT a mild oxidising agent?

<p>Al(−O − C(CH 3 )3 )3 (A)</p> Signup and view all the answers

What is the general formula for aldehydes and ketones?

<p>Cn H 2n O (B)</p> Signup and view all the answers

What is the shape of the molecule around the carbonyl carbon atom?

<p>Trigonal planar (D)</p> Signup and view all the answers

What is the characteristic feature of aldol condensation reaction?

<p>Dehydration occurs readily due to the formation of a conjugated system (D)</p> Signup and view all the answers

What is the primary product formed when propanal undergoes crossed aldol condensation with acetone?

<p>CH_3CH(OH)CH(CH_3)CHO (C)</p> Signup and view all the answers

What is the purpose of using Schiff's reagent in a reaction?

<p>To detect the presence of an aldehyde group (C)</p> Signup and view all the answers

What is the primary function of sodium nitroprusside in a reaction?

<p>To detect the presence of an aldehyde group (D)</p> Signup and view all the answers

What is the reaction condition required for the formation of a benzoin condensation product?

<p>Presence of a strong base catalyst (A)</p> Signup and view all the answers
Use Quizgecko on...
Browser
Open
Browser
Browser