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ISC Class 12 Aldehydes, Ketones and Carboxylic Acids — practice questions

Explore 56 free Aldehydes, Ketones and Carboxylic Acids questions in ISC Class 12 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 1–30 of 56.

Split the carbonyl family in twoRead the answer and worked solution →**Wolff–Kishner reduction** uses which reagent to convert $>C=O$ to $>CH_2$?Read the answer and worked solution →Match each named reactionRead the answer and worked solution →**Hoffmann ammonolysis** of alkyl halide with excess $NH_3$ in sealed tube primarily givesRead the answer and worked solution →Why does the Finkelstein reaction proceed efficiently in acetone but not in water?Read the answer and worked solution →**Williamson's synthesis** of ethers couples an alkoxide withRead the answer and worked solution →The Lewis-acid catalyst typically used in **Friedel–Crafts alkylation** isRead the answer and worked solution →For a carbonyl compound to undergo **aldol condensation**, it must haveRead 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 →The **Finkelstein reaction** uses which solvent for the conversion $RCl \to RI$?Read the answer and worked solution →$CH_3MgBr$ reacts with $CO_2$ followed by acidic workup. The product isRead the answer and worked solution →Which solvent is essential for preparing a Grignard reagent and why?Read the answer and worked solution →Benzene treated with $CH_3COCl$ and anhydrous $AlCl_3$ givesRead the answer and worked solution →The Wurtz reaction on $CH_3CH_2Br$ with sodium in dry ether gives mainlyRead the answer and worked solution →The **Fittig reaction** couples two molecules ofRead the answer and worked solution →**Kolbe's reaction** treats sodium phenoxide with $CO_2$ under pressure to giveRead the answer and worked solution →**Reimer–Tiemann reaction** of phenol with $CHCl_3$ and aq. $NaOH$, followed by hydrolysis, givesRead the answer and worked solution →The reactive electrophile in the Reimer–Tiemann reaction isRead the answer and worked solution →A **cross aldol** condensation between benzaldehyde and acetone (excess acetone) gives, as the major product,Read the answer and worked solution →In the **Etard reaction**, toluene is oxidised to benzaldehyde byRead the answer and worked solution →**Clemmensen reduction** converts $>C=O$ to $>CH_2$ usingRead the answer and worked solution →**Sandmeyer's reaction** converts $ArN_2^+X^-$ to $ArCl$ usingRead the answer and worked solution →Sandmeyer's reaction proceeds via which type of intermediate?Read the answer and worked solution →

Worked practice questions

Split the carbonyl family in two

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Left
Aldehydes
Items
  1. Region
    Aldehydes
    Item
    Silver mirror
  2. Region
    both
    Item
    Adds HCN
  3. Region
    Ketones
    Item
    Two alkyl groups
  4. Region
    Aldehydes
    Item
    Oxidised easily
  5. Region
    both
    Item
    Planar carbonyl
  6. Region
    Ketones
    Item
    Less reactive
  7. Region
    Aldehydes
    Item
    Has an H on C=O
Right
Ketones
Instructions
Drag each property into Aldehydes, Ketones, or the middle where both of them share it.
_Source: syllabus Chemistry Part 2, Ch 8, §8.1.2 (Structure of the Carbonyl Group), p. 4._

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**Wolff–Kishner reduction** uses which reagent to convert $>C=O$ to $>CH_2$?

  1. $NH_2NH_2$ then $KOH/\Delta$
  2. $O_3/Zn$
  3. $NaBH_4$
  4. $Zn(Hg)/HCl$
Show answer and solution

Correct answer: A. $NH_2NH_2$ then $KOH/\Delta$

$>C=O \xrightarrow{NH_2NH_2} >C=N-NH_2 \xrightarrow{KOH, \Delta} >CH_2 + N_2\uparrow$. Basic conditions — ideal when the substrate cannot tolerate the acidic Clemmensen conditions.

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Match each named reaction

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Matching pairs
  1. Left
    Williamson
    Right
    Makes an ether from an alkoxide
  2. Left
    Kolbe
    Right
    Puts a COOH group onto phenol
  3. Left
    Reimer-Tiemann
    Right
    Puts a CHO group onto phenol
Instructions
Tap a reaction on the left, then tap what it makes or does.
_Source: syllabus Chemistry Alcohols Phenols and Ethers, Alcohols_

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