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AP Intermediate 2nd Year Aldehydes, Ketones and Carboxylic Acids — practice questions — page 2

Explore 54 free Aldehydes, Ketones and Carboxylic Acids questions in AP Intermediate 2nd Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Aldehydes, Ketones and Carboxylic Acids questions and exercises with answers

Showing questions 31–54 of 54.

The reaction of formaldehyde with concentrated NaOH is calledRead the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →NEET · Chemistry · Aldehyde / Ketone TestsRead the answer and worked solution →What is the common name of ethanoic acid?Read the answer and worked solution →The property of attracting shared electrons by halogen atoms in a molecule is called:Read the answer and worked solution →In which type of bonding are pairs of electrons shared between atoms?Read the answer and worked solution →What happens to electrons when an ionic bond is formed?Read the answer and worked solution →What actually holds a piece of metal together in metallic bonding?Read the answer and worked solution →A solid salt crystal will not conduct electricity, but the same salt dissolved in water will. What explains this?Read the answer and worked solution →Split the carbonyl family in twoRead the answer and worked solution →Rank four acids by strengthRead the answer and worked solution →Match each carbonyl testRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →NEET · Chemistry · Aldehyde / Ketone TestsRead the answer and worked solution →Which carboxylic acid has the highest $K_a$ (i.e. is the most acidic)?Read the answer and worked solution →The carbonyl carbon in an aldehyde or ketone isRead the answer and worked solution →The reaction of formaldehyde with concentrated NaOH is calledRead the answer and worked solution →Tollens' reagent gives a silver mirror with:Read the answer and worked solution →Match each carbonyl testRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →The IUPAC name of the simplest aldehyde, $\mathrm{HCHO}$, isRead the answer and worked solution →

Worked practice questions

The reaction of formaldehyde with concentrated NaOH is called

  1. the aldol condensation
  2. Cannizzaro disproportionation
  3. the haloform reaction
  4. the Etard oxidation
Show answer and solution

Correct answer: B. Cannizzaro disproportionation

1. syllabus explicitly cites formaldehyde + NaOH as a textbook Cannizzaro example. 2. Mechanism check: formaldehyde ($\mathrm{HCHO}$) has NO $\alpha$-carbon AT ALL — and so no $\alpha$-H. Aldol condensation requires an $\alpha$-H, so it cannot occur. 3. Instead the Cannizzaro disproportionation operates: $2\,\mathrm{HCHO} + \mathrm{NaOH} \to \mathrm{HCOONa} + \mathrm{CH_3OH}$. 4. One molecule of HCHO is REDUCED (to $\mathrm{CH_3OH}$, methanol). Another is OXIDISED (to $\mathrm{HCOONa}$, sodium formate). Two electrons shuttle between the two HCHO molecules. 5. Option A (aldol) is blocked by no $\alpha$-H. Option C (haloform) requires $\mathrm{I_2}$ or $\mathrm{Br_2}$, not present. Option D (Etard) is a different reaction (oxidation of toluene to benzaldehyde with $\mathrm{CrO_2Cl_2}$). _Source: syllabus Chemistry Part 2, Ch 8, §8.4 (Cannizzaro reaction with HCHO), p. 13–14._

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Match each named organic reaction to its description.

Read exercise and reference answers
Matching pairs
  1. Left
    Aldol condensation
    Right
    α-H aldehyde → β-hydroxy aldehyde (base)
  2. Left
    Cannizzaro
    Right
    No α-H aldehyde → acid + alcohol (base)
  3. Left
    Hoffmann bromamide
    Right
    1° amide → 1° amine (Br₂/KOH)
Instructions
Pair the reaction with what it does.
_Source: syllabus Chemistry, Ch 12 'Aldehydes, Ketones and Carboxylic Acids' §12.4_

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Match each named organic reaction to its description.

Read exercise and reference answers
Matching pairs
  1. Left
    Aldol condensation
    Right
    α-H aldehyde → β-hydroxy aldehyde (base)
  2. Left
    Cannizzaro
    Right
    No α-H aldehyde → acid + alcohol (base)
  3. Left
    Hoffmann bromamide
    Right
    1° amide → 1° amine (Br₂/KOH)
Instructions
Pair the reaction with what it does.
_Source: syllabus Chemistry, Ch 12 'Aldehydes, Ketones and Carboxylic Acids' §12.4_

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More Chemistry topics

Amines and BiomoleculesThe d- and f-Block Elements & Coordination CompoundsElectrochemistryChemical KineticsHaloalkanes, Alcohols and EthersSolutionsHaloalkanes and HaloarenesAlcohols, Phenols and Ethers