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Aldehydes and ketones: HCN, NH3 derivatives, Grignard, oxidation, reduction (Wolff-Kishner, Clemmensen)

15 solved questions

Every question from past board papers on Aldehydes and ketones: HCN, NH3 derivatives, Grignard, oxidation, reduction (Wolff-Kishner, Clemmensen), newest paper first. Open any question for its full worked answer.

NEET UG 2025 question paper (official, booklet 45)

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  1. The major product of the following reaction is :

    Reactant: Ph-CO-CH2CH2-CN; (i) \(\mathrm{CH_3MgBr}\) (excess); (ii) \(\mathrm{H_3O^+}\)

    Reactant PhCOCH2CH2CN with reagents, and four product structures: (1) Ph-C(CH3)(OH)-CH2CH2-CN; (2) Ph-C(CH3)(OH)-CH2CH2-C(=O)CH3; (3) Ph-C(CH3)(OH)-CH2CH2-C(CH3)2OH; (4) PhCO-CH2CH2-C(=O)CH3

    4 marks · See worked answer →

  2. Identify the suitable reagent for the following conversion.

    Methyl benzoate (Ph-COOCH3) \(\to\) benzaldehyde (Ph-CHO)

    Methyl benzoate to benzaldehyde conversion

    4 marks · See worked answer →

NEET UG 2024 question paper (official, booklet S6)

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  1. Identify the correct reagents that would bring about the following transformation.

    [structure transformation shown in figure: ring-CH\(_2\)-CH=CH\(_2\) \(\rightarrow\) ring-CH\(_2\)-CH\(_2\)-CHO]

    reaction scheme: ring-CH2-CH=CH2 to ring-CH2-CH2-CHO

    4 marks · See worked answer →

  2. Match List I with List II.

    List I (Reactions): A. [structure: bicyclohexylidene \(\rightarrow\) 2 cyclohexanone] B. [structure: benzene \(\rightarrow\) benzophenone] C. [structure: cyclohexanol \(\rightarrow\) cyclohexanone] D. [structure: ethylbenzene \(\rightarrow\) potassium benzoate]

    List II (Reagents/Condition): I. benzoyl chloride / Anhyd. \(AlCl_3\) II. \(CrO_3\) III. \(KMnO_4\)/KOH, \(\Delta\) IV. (i) \(O_3\) (ii) \(Zn\)-\(H_2O\)

    Choose the correct answer from the options given below:

    List I reaction structures and List II reagents

    4 marks · See worked answer →

NEET UG 2023 question paper (official, booklet G6)

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  1. Complete the following reaction :

    cyclohexanone [A] \(\xrightarrow{HCN}\) cyclohexanone cyanohydrin (1-hydroxycyclohexanecarbonitrile) [B] \(\xrightarrow[\Delta]{conc.\ H_2SO_4}\) [C]

    [C] is ________.

    reaction scheme and four structure options

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  2. Identify product (A) in the following reaction :

    3-(3-acetylphenyl)-substituted cyclohexyl methyl ketone: a cyclohexane ring bearing an acetyl group, joined to a benzene ring bearing an acetyl group (meta), \(\xrightarrow[\text{conc. HCl}]{\text{Zn-Hg}}\) (A) + 2H\(_2\)O

    reactant structure, reagent and four structure options

    4 marks · See worked answer →

NEET UG 2022 question paper (official, booklet R6)

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  1. \(RMgX + CO_2 \xrightarrow{\text{dry ether}} Y \xrightarrow{H_3O^+} RCOOH\)

    What is Y in the above reaction ?

    4 marks · See worked answer →

  2. Match List - I with List - II.

    List - I (Products formed): (a) Cyanohydrin (b) Acetal (c) Schiff's base (d) Oxime

    List - II (Reaction of carbonyl compound with): (i) \(NH_2OH\) (ii) \(RNH_2\) (iii) alcohol (iv) HCN

    Choose the correct answer from the options given below :

    4 marks · See worked answer →

NEET UG 2021 question paper (official, booklet M4)

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  1. What is the IUPAC name of the organic compound formed in the following chemical reaction ?

    Acetone \(\xrightarrow[\text{(ii) } H_2O, H^+]{\text{(i) } C_2H_5MgBr,\ \text{dry Ether}}\) Product

    4 marks · See worked answer →

  2. The product formed in the following chemical reaction is :

    2-(methyl-substituted) cyclohexanone bearing \(CH_2-C(=O)-OCH_3\) and \(CH_3\) groups \(\xrightarrow[C_2H_5OH]{NaBH_4}\) ?

    keto-ester cyclohexanone reacting with NaBH4/C2H5OH and four product structures

    4 marks · See worked answer →

  3. Match List - I with List - II.

    List - I : (a) benzene \(\xrightarrow[\text{Anhyd. }AlCl_3/CuCl]{CO,\ HCl}\) (b) \(R-CO-CH_3 + NaOX \rightarrow\) (c) \(R-CH_2-OH + R'COOH \xrightarrow{\text{Conc. }H_2SO_4}\) (d) \(R-CH_2COOH \xrightarrow[\text{(ii) }H_2O]{\text{(i) }X_2/\text{Red P}}\)

    List - II : (i) Hell-Volhard-Zelinsky reaction (ii) Gattermann-Koch reaction (iii) Haloform reaction (iv) Esterification

    Choose the correct answer from the options given below.

    benzene ring with CO, HCl, Anhyd AlCl3/CuCl arrow (List I item a)

    4 marks · See worked answer →

  4. The intermediate compound 'X' in the following chemical reaction is :

    toluene \(+ CrO_2Cl_2 \xrightarrow{CS_2} X \xrightarrow{H_3O^+}\) benzaldehyde

    Etard reaction scheme and four structure options

    4 marks · See worked answer →

NEET UG 2020 question paper (official, booklet E1)

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  1. Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give :

    4 marks · See worked answer →

NEET UG 2016 Phase 1 question paper (official, booklet A)

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  1. The product formed by the reaction of an aldehyde with a primary amine is :

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NEET UG 2016 Phase 2 question paper (official, booklet ZZ)

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  1. The correct structure of the product \(A\) formed in the reaction [cyclohex-2-enone, \(H_2\) (gas, 1 atmosphere), Pd/carbon, ethanol \(\rightarrow A\)] is

    reaction scheme plus 4 product structure options

    4 marks · See worked answer →