Start learning →

NEET UG Aldehydes, Ketones and Carboxylic Acids — practice questions — page 5

Explore 151 free Aldehydes, Ketones and Carboxylic Acids questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

Practise Aldehydes, Ketones and Carboxylic Acids with Quill →

Aldehydes, Ketones and Carboxylic Acids questions and exercises with answers

Showing questions 121–150 of 151.

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 →The **Gattermann reaction** (not Gatterman–Koch) converts $ArN_2^+X^-$ to $ArX$ usingRead 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 →The **Balz–Schiemann reaction** converts $ArN_2^+$ to $ArF$ via which intermediate?Read the answer and worked solution →Friedel–Crafts alkylation of benzene with $1$-chloropropane and $AlCl_3$ gives, as the major product,Read the answer and worked solution →A **Grignard reagent** has the general formulaRead the answer and worked solution →**Stephen's reduction** converts a nitrile $RCN$ into an aldehyde usingRead 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 →The **Swarts reaction** converts an alkyl chloride to an alkyl fluoride usingRead the answer and worked solution →**Cannizzaro's reaction** is given by aldehydes that haveRead the answer and worked solution →**Diazotisation** of a primary aromatic amine uses $NaNO_2 + HCl$ atRead the answer and worked solution →Which reaction is being described?Read the answer and worked solution →The reaction of $CH_3MgBr$ with formaldehyde ($HCHO$), followed by acidic workup, givesRead the answer and worked solution →**Lucas reagent** is a mixture ofRead the answer and worked solution →In **Wurtz's reaction**, two alkyl halides couple in the presence ofRead the answer and worked solution →Self-aldol condensation of acetaldehyde, after dehydration, givesRead the answer and worked solution →**Rosenmund's reduction** converts an acyl chloride to an aldehyde usingRead 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 →Identify the correct conversion: $CH_3CN \xrightarrow{?} CH_3CHO$ (one step).Read the answer and worked solution →In **Dow's process**, chlorobenzene is converted to phenol by treatment withRead the answer and worked solution →**Gatterman–Koch reaction** formylates benzene usingRead 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 →Match each named organic reaction to its description.Read the answer and worked solution →The product of the Hunsdiecker reaction on $CH_3CH_2COOAg$ with $Br_2/CCl_4$ isRead the answer and worked solution →Match each named organic reaction to its description.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 →

Worked practice questions

A **cross aldol** condensation between benzaldehyde and acetone (excess acetone) gives, as the major product,

  1. Acetophenone
  2. 4-Phenyl-3-buten-2-one
  3. Dibenzalacetone (only)
  4. Cinnamaldehyde
Show answer and solution

Correct answer: B. 4-Phenyl-3-buten-2-one

Acetone has $\alpha$-H, benzaldehyde does not (so benzaldehyde cannot form an enolate — only acetone can). Excess acetone gives mono-condensation product $C_6H_5CH=CHCOCH_3$ (4-phenyl-3-buten-2-one). With excess benzaldehyde, both methyls of acetone react to give dibenzalacetone.

Open this question →

In the **Etard reaction**, toluene is oxidised to benzaldehyde by

  1. $O_3$
  2. $CrO_2Cl_2$ in $CS_2$
  3. $K_2Cr_2O_7/H_2SO_4$
  4. $KMnO_4$
Show answer and solution

Correct answer: B. $CrO_2Cl_2$ in $CS_2$

$C_6H_5CH_3 \xrightarrow{CrO_2Cl_2/CS_2} \text{chromyl complex} \xrightarrow{H_2O} C_6H_5CHO$. Chromyl chloride stops at the aldehyde because the intermediate Etard complex protects the $-CHO$ from over-oxidation until workup.

Open this question →

**Clemmensen reduction** converts $>C=O$ to $>CH_2$ using

  1. $LiAlH_4$
  2. $NH_2NH_2/KOH/\Delta$
  3. $H_2/Ni$
  4. $Zn(Hg)/conc.\,HCl$
Show answer and solution

Correct answer: D. $Zn(Hg)/conc.\,HCl$

Acidic conditions ($Zn$ amalgam + conc. HCl). Reduces ketones/aldehydes all the way to methylene. Use Wolff–Kishner instead if the substrate is base-stable but acid-sensitive.

Open this question →

How to practise

  1. Choose a Aldehydes, Ketones and Carboxylic Acids question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Aldehydes, Ketones and Carboxylic Acids practice for NEET UG. Read explanations as you go. No signup form needed to start.

Practise Aldehydes, Ketones and Carboxylic Acids →

More Chemistry topics

Amines and BiomoleculesChemical KineticsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureSolutionsStructure of Atom