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Aldehydes and Ketones — NEET UG Chemistry PYQs

484 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.

484 questionsChemistrySolutions on every page
1

Base catalyzed aldol condensation occurs with

MHT CET Medical 2026 Solution View → 2

Aromatic aldehydes are less reactive than the aliphatic aldehydes in nucleophilic addition reaction this is due to

MHT CET Medical 2026 Solution View → 3

Identify a final product obtained when Pent-3-enenitrile is treated with AlH (i -Bu )₂ followed by acid hydrolysis.

MHT CET Medical 2026 Solution View → 4

When a mixture of an aldehyde and Fehling solution is boiled in hot water, a red precipitate is formed. Here the obtained red precipitate is of -

MHT CET Medical 2026 Solution View → 5

Which of the following reagents gives the same reduction product with propionaldehyde and acetone ?

MHT CET Medical 2026 Solution View → 6

Which of the following statements regarding the haloform test is NOT correct?

MHT CET Medical 2026 Solution View → 7

Which is the best reagent for the following conversion? CH ₃ -CH=CH-CH ₂ -CHO CH ₃ -CH=CH-CH ₂ -CH ₂ -OH

MHT CET Medical 2026 Solution View → 8

Aldehydes containing at least one -hydrogen atom undergo a reaction in presence of dilute aq. NaOH to form -hydroxyl aldehyde. Identify the reaction.

MHT CET Medical 2026 Solution View → 9

Which of the following reagents converts acid chloride to aldehyde selectively?

MHT CET Medical 2026 Solution View → 10

An organic compound 'A' ( C ₃ H ₆ O ) gives a positive iodoform test but does not reduce Tollens' reagent. Identify the compound 'A':

MHT CET Medical 2026 Solution View → 11

Which one of the following compounds, on reaction with hydrogen cyanide (HCN), gives an optically active cyanohydrin?

MHT CET Medical 2026 Solution View → 12

What is metaldehyde?

MHT CET Medical 2026 Solution View → 13

Which of the following reagents reacts with both aldehydes and ketones?

MHT CET Medical 2026 Solution View → 14

Which of the following compounds will not undergo aldol condensation?

MHT CET Medical 2026 Solution View → 15

Identify a catalyst used in Stephen reaction from the following.

MHT CET Medical 2026 Solution View → 16

What is the product obtained when Pent-3-enenitrile is treated with DIBAL-H followed by acid hydrolysis?

MHT CET Medical 2026 Solution View → 17

Which of the following undergoes Haloform reaction?

MHT CET Medical 2026 Solution View → 18

Benzaldehyde is converted to benzyl alcohol by

MHT CET Medical 2026 Solution View → 19

Which of the following reactions converts > C=O to > CH ₂ ? (A) Rosenmund's reaction (B) Aldol condensation (C) Clemmensen's reduction (D) Wolf-Kishner reduction Choose the correct

MHT CET Medical 2026 Solution View → 20

aligned CH ₂= CH - CHO ? CH ₂= & CH & - CH ₂- OH aligned Suitable reagent for conversion of following reaction?

JIPMER 2019 Solution View → 21

Which of the following will not be formed when calcium acetate is distilled with calcium formate?

JIPMER 2019 Solution View → 22

In the reaction, The major product formed is

JIPMER 2018 Solution View → 23

Cannizzaro reaction is not shown by

JIPMER 2017 Solution View → 24

The product of acid hydrolysis of (P) and (Q) can be distinguished by

JIPMER 2017 Solution View → 25

Which of the following is crossed aldol product in the reaction? CH ₃ CHO + CH ₃ CH ₂ CHO [25^ C ] OH ⁻ ^ P '

JIPMER 2016 Solution View → 26

Choose the correct alkyne and reagents for the preparation of

JIPMER 2015 Solution View → 27

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

JIPMER 2014 Solution View → 28

CH ₃ CHO + HCHO [ Heat ] Dil. NaOH A [ H ₃ O ⁺] HCN B The structure of compound B is

JIPMER 2012 Solution View → 29

The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is

JIPMER 2011 Solution View → 30

Which of the following reagents converts both acetaldehyde and acetone to alkanes ?

JIPMER 2009 Solution View → 31

In which of the following pairs, both molecules possess dipole moment ?

JIPMER 2009 Solution View → 32

The reaction, C ₆ H ₅ CHO + CH ₃ COOC ₂ H ₅ C ₆ H ₅ CH = CHCOOC ₂ H ₅ , is called

JIPMER 2009 Solution View → 33

Which one of the following reactions is called Rosenmund reaction?

JIPMER 2009 Solution View → 34

Which of the following does not reduce Fehling's solution?

JIPMER 2008 Solution View → 35

When dihydroxy acetone reacts with ( HIO ₄ ), the product is/are

JIPMER 2008 Solution View → 36

The major organic product formed from the following reaction [ (ii) LiAlH ₄ (iii) H ₂ O ] (i) CH ₃ NH ₂ is

JIPMER 2007 Solution View → 37

CH ₃ CH ₂ C CH R butanone -2 . R is

JIPMER 2005 Solution View → 38

In the reaction of aldehydes and ketones with hydrogen cyanide (HCN), what is the role of the cyanide ion (CN-)?

NEET Solution View → 39

What role does concentrated alkali play in the Cannizzaro reaction?

NEET Solution View → 40

When is the dehydrogenation method suitable for preparing aldehydes and ketones?

NEET Solution View → 41

Which class of aldehydes does not respond to Fehling's test?

NEET Solution View → 42

What is the role of acid in the addition reaction of ammonia and its derivatives with aldehydes and ketones?

NEET Solution View → 43

What type of compounds are formed in the Aldol condensation reaction?

NEET Solution View → 44

What reagent is used in Tollens' test to detect aldehydes?

NEET Solution View → 45

Which aldehyde is commonly used to preserve biological specimens and in the production of bakelite?

NEET Solution View → 46

Give an example of a compound that adds fragrance to nature and is derived from vanilla beans.

NEET Solution View → 47

What is the purpose of using a catalyst in the Rosenmund reduction?

NEET Solution View → 48

What is the final product obtained after the hydrolysis of benzal chloride?

NEET Solution View → 49

In which type of solvents, such as benzene, ether, methanol, and chloroform, are aldehydes and ketones generally fairly soluble?

NEET Solution View → 50

What type of reaction is the addition of ammonia and its derivatives to aldehydes and ketones?

NEET Solution View → 51

Which functional group in aldehydes is responsible for the reaction with Tollens' reagent?

NEET Solution View → 52

What factor influences the position of the equilibrium in the reaction of sodium hydrogensulphite with aldehydes and ketones?

NEET Solution View → 53

What does the addition of sodium hydrogen sulphide form when it reacts with aldehydes and ketones?

NEET Solution View → 54

What is the name of the intermediate compound formed when aldehydes react with monohydric alcohol in the presence of dry hydrogen chloride?

NEET Solution View → 55

In addition to flavouring agents, for what other purpose are some families of aldehydes, ketones, and carboxylic acids manufactured, according to the paragraph?

NEET Solution View → 56

What heavy metal catalysts are commonly used in the dehydrogenation method for producing aldehydes and ketones?

NEET Solution View → 57

Besides sodium hypobromite, what other halogen reagent can be used for the haloform reaction to detect specific functional groups?

NEET Solution View → 58

Where does the equilibrium position generally lie when sodium hydrogen sulfite reacts with most aldehydes?

NEET Solution View → 59

What can benzylidene diacetate be hydrolyzed into, as mentioned in the paragraph?

NEET Solution View → 60

What are gem-dialkoxy compounds known as, which are formed when hemiacetals react with one more molecule of alcohol?

NEET Solution View → 61

Which of the following is NOT a common role of the carbonyl group in electrophilic substitution reactions?

NEET Solution View → 62

In what important processes of life do aldehydes, ketones, and carboxylic acids play a significant role?

NEET Solution View → 63

What is the primary difference in the oxidation reactions between aldehydes and ketones?

NEET Solution View → 64

Which type of reaction is the Rosenmund reduction classified as?

NEET Solution View → 65

What is the practical application of naturally occurring aldehydes and ketones mentioned in the paragraph?

NEET Solution View → 66

Why is the addition of hydrogen cyanide (HCN) to aldehydes and ketones catalysed by a base?

NEET Solution View → 67

What is the general name for the products of the Aldol condensation reaction?

NEET Solution View → 68

How can the hydrogen sulfite addition compound, formed by the reaction of sodium hydrogensulphite with aldehydes and ketones, be converted back to the original carbonyl compound?

NEET Solution View → 69

What is the result of the reduction of the carbonyl group of aldehydes and ketones with zinc-amalgam and concentrated hydrochloric acid?

NEET Solution View → 70

What does the Rosenmund reduction primarily involve?

NEET Solution View → 71

What type of reaction is involved in Tollens' test?

NEET Solution View → 72

What is the final product formed when an aldehyde reacts with Tollens' reagent?

NEET Solution View → 73

What is the colour change observed during a positive Tollens' test?

NEET Solution View → 74

Which compound, found in cinnamon, is known for its pleasant fragrance?

NEET Solution View → 75

How do the reactivity of aldehydes and ketones change with the number of alkyl groups attached to the carbonyl carbon?

NEET Solution View → 76

What role does the base play in the catalysis of the reaction between aldehydes/ketones and hydrogen cyanide (HCN)?

NEET Solution View → 77

How does dry hydrogen chloride affect the carbonyl compounds in the reaction with alcohols?

NEET Solution View → 78

Which reagent selectively reduces nitriles to imines in an alternative method?

NEET Solution View → 79

What type of cyclic products are formed when ketones react with ethylene glycol under similar conditions?

NEET Solution View → 80

Which lower members of aldehydes and ketones are mentioned as being miscible with water in all proportions?

NEET Solution View → 81

Which element is reduced to form a silver mirror in Tollens' test?

NEET Solution View → 82

What is the purpose of side chain chlorination followed by hydrolysis in the context of benzaldehyde production?

NEET Solution View → 83

What happens to the odour of aldehydes and ketones as the size of the molecule increases?

NEET Solution View → 84

What is the key factor that allows methanal, ethanal, and propanone to be miscible with water?

NEET Solution View → 85

Under what conditions are ketones generally oxidized?

NEET Solution View → 86

What is the outcome of treating a nitrile with a Grignard reagent followed by hydrolysis?

NEET Solution View → 87

What is the pH condition under which Fehling's test occurs?

NEET Solution View → 88

What happens to the aldehyde during Fehling's test?

NEET Solution View → 89

What is the visual indicator of a positive Fehling's test for an aldehyde?

NEET Solution View → 90

Why are aldehydes generally more reactive than ketones in nucleophilic addition reactions?

NEET Solution View → 91

What functional group characterises acyl halides?

NEET Solution View → 92

Why is the reaction involving aldehydes and ketones called Aldol condensation?

NEET Solution View → 93

What are the products of the reduction of aldehydes and ketones by sodium borohydride (NaBH 4 ) or lithium aluminium hydride (LiAlH 4 )?

NEET Solution View → 94

What is the common element in the functional groups found in amides and acyl halides?

NEET Solution View → 95

What is the source of salicylaldehyde, which contributes to the fragrance?

NEET Solution View → 96

What is the product obtained after the hydrolysis of imines produced in the Stephen reaction?

NEET Solution View → 97

What is the name of the reaction where aldehydes undergo self oxidation and reduction in the presence of concentrated alkali?

NEET Solution View → 98

In electrophilic substitution reactions, to which position on the aromatic ring does the carbonyl group typically direct the incoming electrophile?

NEET Solution View → 99

What is the chemical structure of the intermediate formed during the addition reaction of ammonia and its derivatives to aldehydes and ketones?

NEET Solution View → 100

How can acetals and ketals be converted back to the corresponding carbonyl compounds?

NEET Solution View → 101

Which type of reaction is exemplified by the addition of hydrogen cyanide (HCN) to aldehydes and ketones?

NEET Solution View → 102

In the product >C=N-Z, what does Z represent?

NEET Solution View → 103

Why do aldehydes and ketones generally have higher boiling points than hydrocarbons and ethers of comparable molecular masses?

NEET Solution View → 104

What is the result of the oxidation of ketones?

NEET Solution View → 105

What is the chemical symbol for the halogen group in acyl halides?

NEET Solution View → 106

What is the visual indicator of a positive Tollens' test for an aldehyde?

NEET Solution View → 107

What type of products are typically obtained in cross aldol condensation?

NEET Solution View → 108

What is the common name for acyl chloride?

NEET Solution View → 109

What is the outcome of the Cannizzaro reaction for aldehydes without α-hydrogen atoms?

NEET Solution View → 110

When hemiacetals react with one more molecule of alcohol, what type of compound is formed?

NEET Solution View → 111

What is the significance of the statement "miscible with water in all proportions" in the context of methanal, ethanal, and propanone?

NEET Solution View → 112

Which type of oxidising agents can convert aldehydes into carboxylic acids?

NEET Solution View → 113

Which halogen is commonly used in the haloform reaction to oxidize methyl ketones?

NEET Solution View → 114

What is one of the primary applications of aldehydes, ketones, and carboxylic acids in the food and pharmaceutical industries, as mentioned in the paragraph?

NEET Solution View → 115

What is the function of barium sulphate in the Rosenmund reduction?

NEET Solution View → 116

What happens to the aldehyde during Tollens' test?

NEET Solution View → 117

What happens to the aldol and ketol products in Aldol condensation?

NEET Solution View → 118

What is the term for the aldol condensation between two different aldehydes and/or ketones?

NEET Solution View → 119

What is the purpose of mixing Fehling solution A and Fehling solution B in equal amounts before the test?

NEET Solution View → 120

What is the intermediate compound formed when aldehydes react with monohydric alcohol in the presence of dry hydrogen chloride?

NEET Solution View →
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