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JEE Main Aldehydes, Ketones and Carboxylic Acids — practice questions — page 2

Explore 152 free Aldehydes, Ketones and Carboxylic Acids questions in JEE Main 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 31–60 of 152.

The **Fittig reaction** couples two molecules ofRead the answer and worked solution →The Wurtz–Fittig reaction between $C_6H_5Br$ and $CH_3CH_2Br$ with Na in dry ether givesRead the answer and worked solution →**Lucas reagent** is a mixture ofRead the answer and worked solution →Among $1$-butanol, $2$-butanol and $tert$-butanol, the order of reactivity in the Lucas test isRead 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 →In the **cumene process** for industrial phenol production, the by-product formed alongside phenol isRead the answer and worked solution →For a carbonyl compound to undergo **aldol condensation**, it must haveRead the answer and worked solution →Self-aldol condensation of acetaldehyde, after dehydration, givesRead 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 →**Cannizzaro's reaction** is given by aldehydes that haveRead the answer and worked solution →**Rosenmund's reduction** converts an acyl chloride to an aldehyde usingRead the answer and worked solution →**Stephen's reduction** converts a nitrile $RCN$ into an aldehyde usingRead the answer and worked solution →In the **Etard reaction**, toluene is oxidised to benzaldehyde byRead the answer and worked solution →**Gatterman–Koch reaction** formylates benzene usingRead the answer and worked solution →**Clemmensen reduction** converts $>C=O$ to $>CH_2$ usingRead the answer and worked solution →**Wolff–Kishner reduction** uses which reagent to convert $>C=O$ to $>CH_2$?Read the answer and worked solution →The **Hell–Volhard–Zelinsky (HVZ) reaction** converts a carboxylic acid (with $\alpha$-H) to an $\alpha$-halo acid usingRead the answer and worked solution →**Hoffmann ammonolysis** of alkyl halide with excess $NH_3$ in sealed tube primarily givesRead the answer and worked solution →**Diazotisation** of a primary aromatic amine uses $NaNO_2 + HCl$ atRead 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 →The **Gattermann reaction** (not Gatterman–Koch) converts $ArN_2^+X^-$ to $ArX$ usingRead the answer and worked solution →The **Balz–Schiemann reaction** converts $ArN_2^+$ to $ArF$ via which intermediate?Read the answer and worked solution →Which of the following named reactions does **NOT** require an $\alpha$-hydrogen on the substrate?Read the answer and worked solution →Identify the correct conversion: $CH_3CN \xrightarrow{?} CH_3CHO$ (one step).Read the answer and worked solution →As per your syllabus, nitration, the actual ELECTROPHILE that attacks benzene in HNO₃ + H₂SO₄ mixture is which species?Read the answer and worked solution →As per your syllabus, halogenation, the role of anhydrous AlCl₃ (or FeCl₃) in benzene chlorination is which?Read the answer and worked solution →As per your syllabus, Friedel-Crafts ALKYLATION of benzene uses which reagent system?Read the answer and worked solution →

Worked practice questions

The **Fittig reaction** couples two molecules of

  1. aryl halide with Mg in dry ether
  2. alcohol with Na
  3. alkyl halide with Na in dry ether
  4. aryl halide with Na in dry ether
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Correct answer: D. aryl halide with Na in dry ether

$2\,ArX + 2\,Na \to Ar-Ar + 2\,NaX$. Couples two aryl halides to a biaryl. Wurtz couples two alkyl halides Wurtz–Fittig couples one aryl + one alkyl.

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The Wurtz–Fittig reaction between $C_6H_5Br$ and $CH_3CH_2Br$ with Na in dry ether gives

  1. n-Butane
  2. Biphenyl
  3. Ethylbenzene
  4. Toluene
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Correct answer: C. Ethylbenzene

Wurtz–Fittig: $C_6H_5Br + CH_3CH_2Br + 2\,Na \to C_6H_5-CH_2CH_3 + 2\,NaBr$. The mixed coupling between aryl and alkyl halides gives ethylbenzene as the desired product (with biphenyl and butane as side-products).

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**Lucas reagent** is a mixture of

  1. $Br_2$ + $FeBr_3$
  2. conc. $HCl$ + anhydrous $ZnCl_2$
  3. $H_2SO_4$ + $K_2Cr_2O_7$
  4. dil. $HCl$ + $NaOH$
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Correct answer: B. conc. $HCl$ + anhydrous $ZnCl_2$

**Lucas reagent:** conc. HCl + anhydrous $ZnCl_2$. Used to classify alcohols by how fast they turn cloudy: 3° → immediate, 2° → 5 min, 1° → no reaction at RT.

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