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JEE Main Aldehydes, Ketones and Carboxylic Acids — practice questions — page 3

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 61–90 of 152.

As per your syllabus, Friedel-Crafts ACYLATION of benzene uses an acyl halide + AlCl₃ to generate which electrophile?Read the answer and worked solution →As per your syllabus, which of the following groups is a META-directing substituent on benzene?Read the answer and worked solution →As per your syllabus, halogens (-Cl, -Br) on benzene are which kind of directors despite their deactivating -I effect?Read the answer and worked solution →The general formula for alkanes is:Read the answer and worked solution →Tollens' reagent gives a silver mirror with:Read the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →Match each named organic reaction to its description.Read the answer and worked solution →Match each named reactionRead the answer and worked solution →Which reaction is being described?Read the answer and worked solution →Which one does NOT belong?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 carbon to oxygen double bond is called the:Read the answer and worked solution →In an aldehyde the carbonyl carbon is bonded to carbon and:Read the answer and worked solution →In a ketone the carbonyl group is bonded to:Read the answer and worked solution →A carbonyl carbon carrying a hydroxyl group gives a:Read the answer and worked solution →A carbonyl carbon attached to a halogen gives an:Read the answer and worked solution →Esters and anhydrides are derivatives of:Read the answer and worked solution →Vanillin, with its pleasant fragrance, comes from:Read the answer and worked solution →Cinnamaldehyde is obtained from:Read the answer and worked solution →Salicylaldehyde is obtained from:Read the answer and worked solution →Acetone is manufactured mainly for use as a:Read the answer and worked solution →The carbonyl carbon and its three attached atoms lie:Read the answer and worked solution →The bond angles around a carbonyl carbon are about:Read the answer and worked solution →The shape around the carbonyl group is described as:Read the answer and worked solution →The carbon to oxygen double bond is polarised because oxygen is more:Read the answer and worked solution →The carbonyl carbon behaves as a centre that is:Read the answer and worked solution →At room temperature methanal exists as a:Read the answer and worked solution →Aldehydes boil higher than hydrocarbons of like mass because of:Read the answer and worked solution →Aldehydes boil lower than alcohols of like mass because they lack:Read the answer and worked solution →

Worked practice questions

As per your syllabus, Friedel-Crafts ACYLATION of benzene uses an acyl halide + AlCl₃ to generate which electrophile?

  1. Carbanion R⁻ alone
  2. Carbene R₂C: alone
  3. Acylium (RC⁺=O ion)
  4. Free-radical R• alone
Show answer and solution

Correct answer: C. Acylium (RC⁺=O ion)

Your syllabus: RCOCl + AlCl₃ → RC⁺=O + AlCl₄⁻ (acylium ion attacks benzene to give acyl benzene).

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As per your syllabus, which of the following groups is a META-directing substituent on benzene?

  1. -NO₂
  2. -OH
  3. -OCH₃
  4. -NH₂
Show answer and solution

Correct answer: A. -NO₂

Your syllabus: -NO₂, -CN, -CHO, -COR, -COOH, -SO₃H are meta directors (also deactivators). -OH/-NH₂/-OR are o/p directing activators.

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As per your syllabus, halogens (-Cl, -Br) on benzene are which kind of directors despite their deactivating -I effect?

  1. Meta only
  2. Ortho/para
  3. Ipso only
  4. Neither type
Show answer and solution

Correct answer: B. Ortho/para

Your syllabus: halogens are o/p directors via +R (lone-pair donation to ring) yet overall deactivating via -I. Unique combination.

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