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JEE Main Aldehydes, Ketones and Carboxylic Acids — practice questions — page 4

Explore 152 free Aldehydes, Ketones and Carboxylic Acids questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Aldehydes, Ketones and Carboxylic Acids questions and exercises with answers

Showing questions 91–120 of 152.

Methanal, ethanal and propanone mix with water in:Read the answer and worked solution →Solubility of aldehydes falls as the alkyl chain grows:Read the answer and worked solution →Aldehydes and ketones take part in addition that is:Read the answer and worked solution →Against ketones, aldehydes in nucleophilic addition are:Read the answer and worked solution →True or false on carbonyl compoundsRead the answer and worked solution →Quick picks on carbonyl compoundsRead the answer and worked solution →Match each compound to its sourceRead the answer and worked solution →Aldehyde or ketoneRead the answer and worked solution →Higher or lower boiling pointRead the answer and worked solution →Trace a nucleophilic additionRead the answer and worked solution →Fill the gaps on carbonyl compoundsRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →**Wolff–Kishner reduction** uses which reagent to convert $>C=O$ to $>CH_2$?Read the answer and worked solution →Match each named reactionRead the answer and worked solution →**Hoffmann ammonolysis** of alkyl halide with excess $NH_3$ in sealed tube primarily givesRead the answer and worked solution →Why does the Finkelstein reaction proceed efficiently in acetone but not in water?Read the answer and worked solution →**Williamson's synthesis** of ethers couples an alkoxide withRead the answer and worked solution →The Lewis-acid catalyst typically used in **Friedel–Crafts alkylation** isRead the answer and worked solution →For a carbonyl compound to undergo **aldol condensation**, it must haveRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →Tollens' reagent gives a silver mirror with:Read the answer and worked solution →Match each carbonyl testRead the answer and worked solution →Which one does NOT belong?Read the answer and worked solution →The **Finkelstein reaction** uses which solvent for the conversion $RCl \to RI$?Read the answer and worked solution →$CH_3MgBr$ reacts with $CO_2$ followed by acidic workup. The product isRead the answer and worked solution →Which solvent is essential for preparing a Grignard reagent and why?Read the answer and worked solution →Benzene treated with $CH_3COCl$ and anhydrous $AlCl_3$ givesRead the answer and worked solution →The Wurtz reaction on $CH_3CH_2Br$ with sodium in dry ether gives mainlyRead the answer and worked solution →The **Fittig reaction** couples two molecules ofRead the answer and worked solution →**Kolbe's reaction** treats sodium phenoxide with $CO_2$ under pressure to giveRead the answer and worked solution →

Worked practice questions

Methanal, ethanal and propanone mix with water in:

  1. All proportions
  2. Small amounts
  3. Trace amounts
  4. No proportion
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Correct answer: A. All proportions

1. These lower members can form hydrogen bonds with water. 2. That makes them fully miscible. 3. They mix with water in all proportions. _Source: syllabus Chemistry Part II, Chapter 12, Aldehydes, Ketones and Carboxylic Acids._

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Solubility of aldehydes falls as the alkyl chain grows:

  1. Warmer
  2. Longer
  3. Shorter
  4. Colder
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Correct answer: B. Longer

1. Only the carbonyl end can hydrogen bond with water. 2. A longer alkyl chain makes that end count for less. 3. So solubility drops rapidly as the chain lengthens. _Source: syllabus Chemistry Part II, Chapter 12, Aldehydes, Ketones and Carboxylic Acids._

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Aldehydes and ketones take part in addition that is:

  1. Free radical
  2. Substitution
  3. Nucleophilic
  4. Electrophilic
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Correct answer: C. Nucleophilic

1. The carbonyl carbon is short of electrons. 2. It is therefore attacked by electron rich species. 3. So these compounds undergo nucleophilic addition. _Source: syllabus Chemistry Part II, Chapter 12, Aldehydes, Ketones and Carboxylic Acids._

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