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Aldehydes and Ketones — JEE Main & Advanced Chemistry PYQs

526 previous year questions from Aldehydes and Ketones with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

526 questionsChemistrySolutions on every page
1

Consider the following reaction. The major product (P) formed is:

JEE Main 2026 Solution View → 2

' x ' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. ' y ' is the major product obtain

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' x ' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K. ' y ' is the product which is obtai

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Given below are two statements: Statement-I: The condensation reaction between CH₃-CH=O and under optimum pH will produce . Statement-II: The molecule will generate Ph-CH=O in the

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An organic compound " x " where molar ratio of C, O and H are equal, on treatment with 50 % KOH under reflux followed by acidification produced " y ". The most likely structure of

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Given below are the four isomeric compounds ( P , Q , R , S ) Identify correct statements from below. A. Q , R and S will give precipitate with 2,4- DNP . B. P and Q will give posi

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Given below are two statements: Statement I : Cross aldol condensation between two different aldehydes will always produce four different products. Statement II : When semicarbazid

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Which of the following statements are TRUE about Haloform reaction?: A. Sodium hypochlorite reacts with KI to give KOI. B. KOI is a reducing agent. C. , -unsaturated methylketone (

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Iodoform test can differentiate between A. Methanol and Ethanol B. CH ₃ COOH and CH ₃ CH ₂ COOH C. Cyclohexene and cyclohexanone D. Diethyl ether and Pentan-3-one E. Anisole and ac

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' x ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' y ' is the product which is obtained

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The compound A, C ₈ H ₈ O ₂ reacts with acetophenone to form a single product via cross-Aldol condensation. The compound A on reaction with conc. NaOH forms a substituted benzyl al

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Match the List-I with List-II ( array |c|l|c|l| & List-I (Reagents) & & List-II (Name of reaction & & & involving carbonyl compounds) A. & NH₂ - NH₂, KOH & I. & Tollen's Test B. &

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Match List - I with List - II. array l List - I & List - II Reagents & Reaction Name (Involving aldehydes) A. H ₂, Pd - BaSO ₄ & I. Etard Reaction B. SnCl ₂, HCl & II. Rosenmund Re

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An organic compound " P " of molecular formula C ₆ H ₁₂ O ₃ gives positive Iodoform test but negative Tollen's test. When " P " is treated with dilute acid, it produces " Q ". " Q

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"P" is an optically active compound with molecular formula C ₆ H ₁₂ O . When " P " is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tol

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Which among the following compounds give yellow solid when reacted with NaOI / NaOH ? Choose the correct answer from the options given below :

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Aldol condensation is a popular and classical method to prepare , -unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of

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The major product ( P ) in the following reaction is :

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Number of molecules from below which cannot give ioddoform reaction is : Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentana

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An optically active alkyl halide ( C ₄ H ₉ Br ) [A] reacts with hot KOH dissolved in ethanol and forms alkene [B] as major product which reacts with bromine to give dibromide [C].

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The product (( P ) ) formed in the following reaction is :

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Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol Condensation D. Tollen's Test E. Clemmens

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A molecule (" P ") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives (" R "). The structure of (

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Choose the correct answer from the options given below :

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Aman has been asked to synthesise the molecule (x).He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He th

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Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

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Given below are two statements : Consider the following reaction

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Choose the correct answer from the options given below :

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The major product of the following reaction is: CH ₃ CH ₂ CH = O [ reflux ] excess HCHO alkali ?

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Residue ( A )+ HCl (dil) Compound ( B ) Structure of residue (A) and compound (B) formed respectively is :

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Paragraph I: An organic compound ( P ) with molecular formula ( C ₉ H ₁₈ O ₂ ) decolorizes bromine water and also shows positive iodoform test. ( P ) on ozonolysis followed by trea

JEE Advanced 2024 Solution View → 32

Paragraph I: An organic compound ( P ) with molecular formula ( C ₅ H ₁₈ O ₂ ) decolorizes bromine water and also shows positive iodoform test. ( P ) on ozonolysis followed by trea

JEE Advanced 2024 Solution View → 33

Match List I with List II ( array |l|l|l|l| & List - I (Test) & & List - II (Observation) A. & Br ₂ water test & I. & Yellow orange or orange red precipitate formed B. & Ceric ammo

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Which of the following compound can give positive iodoform test when treated with aqueous ( KOH ) solution followed by potassium hypoiodite.

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Which of the following compounds will give silver mirror with ammoniacal silver nitrate? A. Formic acid B. Formaldehyde C. Benzaldehyde D. Acetone Choose the correct answer from th

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Identify major product " ( X ) " formed in the following reaction :

JEE Main 2024 Solution View → 37

Match List - I with List - II. ( array |c|c|c|c| & (Test) & & (Identification) (A) & Bayer's test MARKS & (I) & Phenol VIARKS (B) & Ceric ammonium nitrate test & (II) & Aldehyde (C

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Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous ( NaOH ) after heating gives (x ) as the major product. The number of ( ) bonds in the pro

JEE Main 2024 Solution View → 39

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

JEE Main 2024 Solution View → 40

In the Claisen-Schmidt reaction to prepare (351 ~g ) of dibenzalacetone using (87 ~g ) of acetone, the amount of benzaldehyde required is ______ g. (Nearest integer)

JEE Main 2024 Solution View → 41

Identify ' (A ) ' in the following reaction:

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Given below are two statements : Statements I : Acidity of ( )-hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II : Reaction between benzaldehyde an

JEE Main 2024 Solution View → 43

Identify the product in the following reaction :

JEE Main 2024 Solution View → 44

The number of the correct reaction(s) among the following is ______

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Match List – I with List –II. Choose the correct answer from options given below:

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Identify the name reaction.

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The product of the following reaction is P . The number of hydroxyl groups present in the product P is________.

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m-chlorobenzaldehyde on treatment with 50 % KOH solution yields

JEE Main 2024 Solution View → 49

This reduction reaction is known as:

JEE Main 2024 Solution View → 50

The compound formed by the reaction of ethanal with semicarbazide contains _______ number of nitrogen atoms.

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Identify the reagents used for the following conversion

JEE Main 2024 Solution View → 52

From the compounds given below, number of compounds which give positive Fehling's test is Benzaldehyde, Acetaldehyde, Acetone, Acetophenone,Methanal, 4-nitrobenzaldehyde, cyclohexa

JEE Main 2024 Solution View → 53

In the following reactions, P, Q, R and S are the major products. The correct statement(s) about P, Q, R and S is(are)

JEE Advanced 2023 Solution View → 54

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match List-I with List-II and choose the correct option. Li

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D - ( + ) - Glyceraldehyde → ii ) H 2 O / H + iii ) HNO 3 i ) HCN The products formed in the above reaction are

JEE Main 2023 Solution View → 56

A in the above reaction is :

JEE Main 2023 Solution View → 57

The value of x in compound ‘ D ’ is _____

JEE Main 2023 Solution View → 58

The mass of NH 3 produced when 131 . 8 kg of cyclohexane carbaldehyde undergoes Tollen’s test is _____ kg . (Nearest Integer) Molar mass of C = 12 g / mol N = 14 g / mol O =

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‘A’ and ‘B’ in the above reactions are:

JEE Main 2023 Solution View → 60

The ratio x/y on completion of the above reaction is ______ .

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. Match List I with List II : List I (Reagents used) List II (Compound with Functional group detected) A. Alkaline solution of copper sulphate and sodium citrate I. B. Neutral FeCl

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Among the following the number of compounds which will give positive iodoform reaction is _____. (a) 1 -Phenylbutan- 2 -one (b) 2 -Methylbutan- 2 -ol (c) 3 -Methylbutan- 2 -ol (d)

JEE Main 2023 Solution View → 63

The structures of major products A , B and C in the following reaction are sequence.

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Number of isomeric compounds with molecular formula C 9 H 10 O which (i) do not dissolve in NaOH (ii) do not dissolve in HCl . (iii) do not give orange precipitate with 2 , 4 - DNP

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Cyclohexylamine when treated with nitrous acid yields (P). On treating (P) with PCC results in (Q). When (Q) is heated with dil. NaOH we get (R) The final product (R) is:

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The number of molecules which gives haloform test among the following molecules is :

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Consider the following reaction Propanal + Methanal = → ( ii )   Δ ( iii )   NaCN ( iv )   H 3 O + ( i )   dil .   NaOH P roduct   B ( C 5

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Which of the following compounds would give the following set of qualitative analysis? (i) Fehling’s Test: Positive (ii) Na fusion extract upon treatment with sodium nitropru

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Find out the major products from the following reaction sequence.

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Match List I with List II. List I List II Reaction Reagents (A) Hoffmann Degradation (I) Conc. KOH , Δ (B) Clemmensen reduction (II) CHCl 3 , NaOH / H 3 O + (C) Cannizzaro rea

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Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is _________

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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R : Assertion A: Acetal/Ketal is stable in basic medium. Reason R: The high leavi

JEE Main 2023 Solution View → 73

' R ' formed in the following sequence of reaction is:

JEE Main 2023 Solution View → 74

Compound X undergoes following sequence of reactions to give the Lactone Y .

JEE Main 2023 Solution View → 75

The number of stereoisomers formed in a reaction of ± PhC = O C OH CN Ph with HCN is

JEE Main 2022 Solution View → 76

Consider the following reaction sequence ​​​​​​​ The product ' B ' is

JEE Main 2022 Solution View → 77

Match List-I with List-II. List-I List-II A I Gatterman Koch reaction B II Etard reaction C III Stephen reaction D IV Rosenmund reaction Choose the correct answer from the options

JEE Main 2022 Solution View → 78

The products formed in the following reaction, A and B are ​​​​​​​

JEE Main 2022 Solution View → 79

Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide PhMgBr followed by acidic hydrolysis?

JEE Main 2022 Solution View → 80

What is the major product of the following reaction?

JEE Main 2022 Solution View → 81

CH 3 - CH 2 - CN → Ether CH 3 MgBr A → H 3 O + B → HCl Zn - Hg C . The correct structure of C is

JEE Main 2022 Solution View → 82

Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?

JEE Main 2022 Solution View → 83

In the given reaction (Where Et is - C 2 H 5 ) The number of chiral carbon/s in product A is

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In the given reaction, The number of π electrons present in the product ' P ' is ____________.

JEE Main 2022 Solution View → 85

Isobutyraldehyde on reaction with formaldehyde and K 2 CO 3 gives compound ' A '. Compound ' A ' reacts with KCN and yields compound ' B ', which on hydroly

JEE Main 2022 Solution View → 86

The correct structure of product ' A ' formed in the following reaction,

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' A ' and ' B ' respectively are A. → 2 Zn - H 2 O 1 O 3 Ethane- 1 , 2 -dicarbaldehyde + Glyoxal/Oxaldehyde B → 2 Zn - H 2 O 1 O 3 5 - -oxohexanal

JEE Main 2022 Solution View → 88

Toluene can be easily converted into benzaldehyde by which of the following reagents?

JEE Main 2022 Solution View → 89

The final product ' A ' in the following reaction sequence

JEE Main 2022 Solution View → 90

Which of the following conditions or reaction sequence will NOT give acetophenone as the major product?

JEE Main 2022 Solution View → 91

Experimentally reducing a functional group cannot be done by which one of the following reagents ?

JEE Main 2021 Solution View → 92

Given below are two statements : Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion. State

JEE Main 2021 Solution View → 93

For the reaction given below : The compound which is not formed as a product in the reaction is a :

JEE Main 2021 Solution View → 94

The structures of A and B formed in the following reaction are : Ph = - C 6 H 5

JEE Main 2021 Solution View → 95

The structure of the starting compound P used in the reaction given below is:

JEE Main 2021 Solution View → 96

The major product of the following reaction is:

JEE Main 2021 Solution View → 97

In the following sequence of reactions, the final product D is:

JEE Main 2021 Solution View → 98

The number of stereoisomers possible for 1 , 2 -dimethyl cyclopropane is:

JEE Main 2021 Solution View → 99

The major products formed in the following reaction sequence A and B are:

JEE Main 2021 Solution View → 100

Consider the given reaction, the product ' X ' is:

JEE Main 2021 Solution View → 101

The major product (P) in the following reaction is:

JEE Main 2021 Solution View → 102

Which among the above compound/s does/do not form Silver mirror when treated with Tollen's reagent?

JEE Main 2021 Solution View → 103

Consider the above reaction, the product X and Y respectively are :

JEE Main 2021 Solution View → 104

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula Ag NH 3 2 + per aldehyde group to form silver mirror is ___.(Ro

JEE Main 2021 Solution View → 105

The product "A" in the above reaction is:

JEE Main 2021 Solution View → 106

Considering the above reaction, the major product among the following is:

JEE Main 2021 Solution View → 107

2 , 4 - DNP test can be used to identify :

JEE Main 2021 Solution View → 108

Identify A in the given chemical reaction.

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Identify A in the following chemical reaction.

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A C 4 H 8 Cl 2 → 373 K Hydrolysis B C 4 H 8 O B reacts with Hydroxyl amine but does not give Tollen's test. Identify A and B .

JEE Main 2021 Solution View → 111

The major product of the following reaction is : CH 3 CH 2 CH = CH 2 → Rh catalyst H 2 / CO

JEE Main 2021 Solution View → 112

Which of the following reagent is suitable for the preparation of the product in the above reaction?

JEE Main 2021 Solution View → 113

Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of HgSO 4 and H 2 SO 4 ?

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Which of the following reagent is used for the following reaction? CH 3 CH 2 CH 3   → ? CH 3 CH 2 CHO  

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A and B in the following reactions are:

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In the reaction scheme shown below, Q , R , and S are the major products. The correct structure of

JEE Advanced 2020 Solution View → 117

The correct match between Item-I (starting material) and Item-II (reagent) for the preparation of benzaldehyde is : Item-I Item-II (I) Benzene (P) HCl and SnCl 2 , H 3 O + (II) Ben

JEE Main 2020 Solution View → 118

The major product [ R ] in the following sequence of reaction is :

JEE Main 2020 Solution View → 119

The major product [ C ] of the following reaction sequence will be :

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The increasing order of the reactivity of the following compounds in nucleophile addition reaction is: Propanal, Benzaldehyde, Propanone, Butanone

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