Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry · every board question from this chapter, 2022–2026
- Which of the reactions is used in the conversion of a ketone into hydrocarbon?2026
- Which of the following product is formed when salicylic acid is treated with (CH_3 CO)_2 O in the presence of acid?2026
- Which of the following Grignard Reagent will be used to prepare when treated with methanal?2026
- Assertion: All aliphatic aldehydes give a positive Fehling's test. Reason (R): Aliphatic aldehydes are reduced by Fehling's…2026
- Gives the structures of A, B and C in the following reactions:2026
- How do you convert the following? Toluene to Benzaldehyde Benzoyl chloride to Acetophenone Bromobenzene to Benzoic acid []2026
- What happens when: Propanenitrile is treated with phenyl magnesium bromide followed by hydrolysis? p-fluorotoluene is treated…2026
- Give reasons for the following: Carboxylic acids have higher boiling point than alcohols of comparable molecular masses. Alpha (…2026
- Write the reaction involved in 1+1+1 Rosenmund's reduction Cannizzaro's reaction Hell - Volhard - Zelinsky reaction2026
- How do you convert the following? Benzene to m-Nitroacetophenone Bromobenzene to 1-Phenylethanol But-3-en-2-one to…2026
- How do you convert the following? Acetophenone to Benzoic acid Acetonitrile to Acetone Benzoic acid to Benzene2026
- (i) Arrange the following compounds in increasing order of their acidic strengths: (ii) Why is CH_3 CHO more reactive than…2026
- (i) An organic compound (X) has the molecular formula C_5 H_10 O. Draw structures for (X) if it: 3 + 2 (I) does not give Tollen's…2026
- How will you convert the following: 3 + 2 (i) Propanone to Propene (ii) Benzoic acid to Benzaldehyde (iii) Benzene to…2026
- (i) How will you bring about the following conversions: (I) Bromobenzene to 1-phenylethanol (II) Benzene to m-nitroacetophenone…2026
- (i) Write the product(s) when: (I) One mol of ethanal is treated with 1 mol of CH_3 OH in the presence of dry HCl gas. (II)…2026
- Which of the following aldehydes will undergo Cannizzaro reaction?2025
- The acid formed when propyl magnesium bromide is treated with CO_2 followed by acid hydrolysis is:2025
- CH_3 CH_2 CHO and CH_3 CH_2 COOH can be distinguished by:2025
- Assertion: The solubility of aldehydes and ketones in water decreases with increase in size of the alkyl group. Reason (R):…2025
- Draw the structures of product(s) in each of the following reactions:2025
- Would you expect benzaldehyde to be more reactive or less reactive in nucleophilic addition reactions than propanal? Justify your…2025
- Give a simple chemical test to distinguish between 3-pentanone and 2-pentanone. Write an equation for Clemmensen reduction.2025
- Write the structures of the main products of the following reactions:2025
- How can acetaldehyde be prepared from acetyl chloride? Propanal is more reactive than propanone towards nucleophilic addition…2025
- Carboxylic acid is more acidic than phenol. Give reason. Give a chemical test to distinguish between benzaldehyde and…2025
- Write the products formed in the following reactions: CH_3 CHO+NH_2 CONHNH_2 → 1 CH_3 CHO → dil. NaOH 1 CH_3 COOH →[H_2 O]Cl_2 /…2025
- Explain the following reactions and write chemical equation involved: Wolff-Kishner reduction Etard reaction Cannizzaro reaction…2025
- An aromatic compound 'A' with molecular formula C_8 H_8 O gives positive 2,4-DNP test. It gives yellow precipitate. of compound…2025
- Give reasons for the following: Benzoic acid does not undergo Friedel-Crafts reaction. HCHO is more reactive than CH_3 CHO…2025
- Identify P, Q and R in the following reaction sequence: P →NH_3 CH_3 COO^- NH_4^+ →Δ Q; PCl_5 R2025
- A compound with molecular formula C_4 H_5 N on reduction with DIBAL-H followed by hydrolysis, gives a compound. Compound gives…2025
- An organic compound 'A' (molecular formula C_8 H_8 O ) gives 2,4-DNP test. It does not give Tollen's test, but gives a yellow…2025
- Write structure of the products of the following reactions:2025
- A compound 'A' with molecular formula C_4 H_8 O gives positive 2,4-DNP test. It gives yellow precipitate of compound 'B' on…2025
- (i) Complete the following reactions by writing the structure of the main products: (II) (CH_3) _2 Cd+2 CH_3 COCl → (III) (ii)…2025
- Give IUPAC name of CH_3-CH=CH-CHO. Give a simple chemical test to distinguish between propanal and propanone. How will you…2025
- Give IUPAC name of CH_3-CH=CH-CHO. Give a simple chemical test to distinguish between propanal and propanone. 1 How will you…2025
- (i) Identify A, B and C in the following reactions: (ii) Give reasons for the following: (I) Carboxylic acids do not give the…2025
- (i) An organic compound (X) having molecular formula C_5 H_10 O can show various properties depending on its structures. Draw…2025
- Carry out the following conversions: (2+3=5) (i) Ethanal to But-2-enal (ii) Propanoic acid to ethane An alkene A with molecular…2025
- Which of the following compounds will give a ketone on oxidation with chromic anhydride (CrO_3)?2024
- Which of the following is the strongest acid?2024
- The product formed as a result of reaction of CH_3 MgBr and CO_2 followed by hydrolysis is:2024
- Rosenmund reduction is used for the preparation of Aldehydes. The catalyst used in this reaction is2024
- Which of the following contains sp^2 hybridised carbon bonded to X?2024
- Which one of the following compounds has the lowest pK_a value?2024
- Which of the following Grignard reagent will be used with methanal to prepare2024
- Decarboxylation of sodium benzoate on heating with soda lime gives:2024
- Acetic acid reacts with PCl_5 to give:2024
- The formation of cyanohydrin from an aldehyde is an example of:2024
- Nucleophilic addition of Grignard reagent to ketones followed by hydrolysis with dilute acids forms:2024
- Assertion: Fluoroacetic acid is stronger acid than chloroacetic acid. Reason (R): This is due to greater electron withdrawing…2024
- Assertion: Benzoic acid does not undergo Friedel - Crafts reaction. Reason (R): Carboxyl group is deactivating and the catalyst…2024
- Assertion: The pK_a of O_2 N-CH_2-COOH is lower than that of CH_3-COOH. Reason (R): -NO_2 group shows electron withdrawing effect…2024
- Assertion: The pK_a of ethanoic acid is lower than that of Cl-CH_2-COOH. Reason (R): Chlorine shows electron withdrawing (-I)…2024
- Write the chemical equations when: Pentan-3-one is treated with H_2 N-NH_2 followed by heating with KOH in high boiling solvent…2024
- Write the stepwise mechanism of nucleophilic addition reactions in the carbonyl compounds. OR How will you convert the following:…2024
- Write the chemical equations when: Ethanal is treated with 2,4-dinitrophenylhydrazine? Propanone is treated with Zn(Hg) and conc.…2024
- Write the chemical equation when: Butan-2-one is treated with Zn(Hg) and conc. HCl. Two molecules of benzaldehyde are treated…2024
- Write the reaction involved in the following: Wolff-Kishner reduction Decarboxylation reaction Cannizzaro reaction2024
- Give chemical tests to distinguish between the following pairs of compounds: (i) Phenol and Benzoic acid (ii) Propanal and…2024
- How will you bring about the following conversions? (any three) Benzoic acid to Benzaldehyde Ethanal to Propanone Acetophenone to…2024
- Compound (C_6 H_12 O_2) on reduction with LiAlH_4 gives two compounds and. The compound on oxidation with PCC gives compound…2024
- An organic compound with the molecular formula C_9 H_10 O forms 2, 4-DNP derivative, reduces Fehling solution and undergoes…2024
- (i) Write the major product(s) in the following reactions: (2) (3) (ii) Give simple chemical tests to distinguish between the…2024
- (i) Account for the following: (1) Oxidation of aldehydes is easier as compared to ketones. (2) The alpha ( α ) hydrogen atoms of…2024
- A compound with molecular formula C_5 H_10 O, forms a phenyl hydrazone and gives negative Tollens'and iodoform tests. The…2023
- The reactivities of the carbonyl compounds HCHO (I), CH_3 CHO (II) and CH_3 COCH_3 (III) towards nucleophilic addition reaction…2023
- Which of the following reagents would one choose to transform CH_3 COCl into acetone?2023
- The reagent that can be used to distinguish acetophenone and benzophenone is2023
- Which of the following does not give Cannizaro reaction?2023
- Which of the following is most reactive in nucleophilic addition reactions?2023
- Which of the following does not give aldol condensation reaction?2023
- Aldehydes and ketones react with hydroxylamine to form 12023
- Which one of the following has lowest pK_a value?2023
- Which of the following compounds will undergo self-condensation in the presence of dilute NaOH solution?2023
- This reaction is known as:2023
- C_6 H_5 CHO+CH_3 COCH_3 →[Δ]OH^- C_6 H_5 CH=CH-COCH_3 This reaction is known as:2023
- Which of the following is an 'Acetal'?2023
- Assertion: Acetic acid but not formic acid can be halogenated in presence of red P and C l_2. Reason (R): Acetic acid is a weaker…2023
- Assertion: The final product in Aldol condensation is always α, β - unsaturated carbonyl compound. Reason (R): α, β -unsaturated…2023
- Give the structures and IUPAC name of the products expected from the following reactions: Reaction of methanal with followed by…2023
- Write the structures and IUPAC names of the products expected from the following reactions: Reaction of methanal with (CH_3)_2…2023
- Do the following conversions in not more than two steps: 2 × 1 CH_3 COOH to CH_3 COCH_3 to2023
- Give reasons for the following: Carboxylic carbon is less electrophilic than Carbonyl carbon of aldehydes and ketones. Propanal…2023
- Write the products of the following reactions: OR Do the following conversions in not more than two steps: (i) Toluene to Benzoic…2023
- Give reasons: Formic acid is a stronger acid than acetic acid. Alpha ( α ) -Hydrogens of aldehydes and ketones are acidic.2023
- Explain why: (i) Carboxyl group in benzoic acid is meta directing. (ii) Sodium bisulphite is used for the purification of…2023
- Explain why: (i) Carboxyl group in benzoic acid is meta directing. (ii) Sodium bisulphite is used for the purification of…2023
- The carbon - oxygen double bond is polarised in aldehydes and ketones due to higher electronegativity of oxygen relative to…2023
- (i) Carry out the following conversions: (1) Ethanal to But-2-en-1-al (2) Propanoic acid to 2-chloropropanoic acid (ii) An alkene…2023
- Draw structure of the 2,4-dinitrophenylhydrazone of benzaldehyde. Which acid of the following pair is a stronger acid? or Write…2023
- (i) Write the reaction involved in Cannizaro's reaction. 1+1+3=5 (ii) Why are the boiling point of aldehydes and ketones lower…2023
- (i) An organic compound (X) having molecular formula C_5 H_10 O can show various properties depending on its structures. Draw…2023
- (i) Carry out the following conversions: (1) Ethanal to But-2-en-1-al (2) Propanoic acid to 2-chloropropanoic acid (ii) An alkene…2023
- Arrange the following compounds in the increasing order of their property indicated: (Any two) (i) Acetaldehyde, Benzaldehyde,…2022
- Arrange the following compounds in increasing order of their property as indicated in bracket: (Any two ) (i) CH_3-CHO,,…2022
- How will you carry out the following conversions: (Any two) (i) Propanal to Propane (ii) Ethanal to But-2-enal (iii) Ethanoic…2022
- Predict the products formed when CH_3 CH_2 CHO reacts with the following reagents: (Any two) (i) PhMgBr and then H_3 O^+ (ii)…2022
- Predict the reagent for carrying out the following transformations: (Any two) (i) Benzoyl chloride to Benzaldehyde (ii) Ethanal…2022
- Predict the products formed when CH_3 CHO reacts with the following reagents: (Any two) (i) CH_3 MgBr and then H_3 O^+ (ii)…2022
- Arrange the following in the increasing order of the property mentioned: CH_3 COOH, ClCH_2 COOH, FCH_2 COOH (Acid strength) CH_3…2022
- Arrange the following in the increasing order of their property indicated: Ethanal, Propanone, Propanal, Butanone (reactivity…2022
- Explain the following reactions: Clemmensen reduction Stephen reaction2022
- Write the products formed when benzaldehyde reacts with the following reagents (Any two): (i) CH_3 CHO in presence of dilute NaOH…2022
- Give reasons for the following statements: (Any two) (i) Benzaldehyde is less reactive than propanal in nucleophilic addition…2022
- Write reasons for the following statements: (i) Benzoic acid does not undergo Friedel-Crafts reaction. (ii) Oxidation of…2022
- Explain the following reactions: Wolff Kishner reduction Cannizzaro reaction2022
- (i) (CH_3)_3 C-CHO does not undergo aldol condensation. Why? (ii) Distinguish between Acetophenone and Benzophenone with the help…2022
- Predict the products in the following reactions: (i) CH_3MgBr + CO_2 →H_3O^+ (ii) CH_3CN →[(b) H_2O](a) DIBAL-H OR Arrange the…2022
- Write the major products in the following: OR (i) Oxidation of propanal is easier than propanone. Why? (ii) How can you…2022
- Write the equations involved in the following reactions: (i) Cannizzaro reaction (ii) Aldol condensation (iii)…2022
- A compound 'A' (C_2 H_4 O) on oxidation gives 'B' (C_2 H_4 O_2). 'A' undergoes Iodoform reaction to give yellow precipitate and…2022
- An organic compound 'X' with the molecular formula C_5 H_10 O forms 2,4-DNP derivative, does not reduce Tollens' reagent but…2022
- What happens when (i) Propanone is treated with CH_3 MgBr and then hydrolysed? (ii) Ethanal is treated with excess ethanol and…2022
- Write the equation involved in the following reactions: (i) Rosenmund reduction (ii) Etard reaction (iii) Stephen reaction OR (i)…2022
- Complete the following: (i) CH_3 CN →[ 2. H_2 O] 1. A 1 H(i-Bu)_2^′ A^′ →[H^+]H_2 N-OH 'B' (ii) Write IUPAC name of the following…2022
- (i) Which acid of the following pair would you expect to be stronger? F-CH_2-COOH or CH_3-COOH (ii) Arrange the following…2022
- Read the passage given below and answer the questions that follow: Aldehydes, ketones and carboxylic acids are some of the…2022
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