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Karnataka PUC II Amines and Biomolecules — practice questions — page 2

Explore 201 free Amines and Biomolecules questions in Karnataka PUC II Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Amines and Biomolecules questions and exercises with answers

Showing questions 31–60 of 201.

The order of boiling points of isomeric amines is:Read the answer and worked solution →The pKb value of ammonia is:Read the answer and worked solution →Aromatic amines are weaker bases than ammonia because the aryl group is:Read the answer and worked solution →Aniline is a resonance hybrid of how many structures?Read the answer and worked solution →Which reaction is used as a test for primary amines?Read the answer and worked solution →Hinsberg's reagent used to tell amines apart is:Read the answer and worked solution →Aniline with bromine water at room temperature gives:Read the answer and worked solution →The activating power of the amino group is curbed by:Read the answer and worked solution →Aniline heated with sulphuric acid finally yields:Read the answer and worked solution →Aniline fails to undergo the Friedel-Crafts reaction because it:Read the answer and worked solution →Benzenediazonium chloride is made from aniline and nitrous acid at:Read the answer and worked solution →Replacing the diazo group by chlorine using a copper one salt is the:Read the answer and worked solution →Introducing halogen using copper powder and a halogen acid is the:Read the answer and worked solution →Iodobenzene is obtained by treating the diazonium salt with:Read the answer and worked solution →Coupling of benzenediazonium chloride with phenol gives:Read the answer and worked solution →Match each name to the reaction it labelsRead the answer and worked solution →Order the steps to a coloured azo dyeRead the answer and worked solution →True or false about aminesRead the answer and worked solution →Sort each route by the amine it givesRead the answer and worked solution →Fill the gaps on amine chemistryRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →Does it react with a primary amine only?Read the answer and worked solution →Pick the right answer, quicklyRead the answer and worked solution →Carbohydrates are defined as optically active polyhydroxy:Read the answer and worked solution →Carbohydrates are also known by which other name?Read the answer and worked solution →A carbohydrate that cannot be hydrolysed further is a:Read the answer and worked solution →Oligosaccharides give on hydrolysis how many monosaccharide units?Read the answer and worked solution →Polysaccharides are also called non-sugars because they are not:Read the answer and worked solution →Sugars that reduce Tollens' reagent are called:Read the answer and worked solution →A monosaccharide holding an aldehyde group is called an:Read the answer and worked solution →

Worked practice questions

The order of boiling points of isomeric amines is:

  1. Tertiary > primary > secondary
  2. Primary > secondary > tertiary
  3. Tertiary > secondary > primary
  4. Secondary > primary > tertiary
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Correct answer: B. Primary > secondary > tertiary

1. A primary amine has two hydrogens for bonding. 2. A secondary amine has only one and a tertiary none. 3. More bonding means a higher boiling point. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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The pKb value of ammonia is:

  1. 7.45
  2. 9.45
  3. 4.75
  4. 1.75
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Correct answer: C. 4.75

1. Aliphatic amines sit in the range 3 to 4.22. 2. They are stronger bases than ammonia. 3. Ammonia itself has a pKb of 4.75. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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Aromatic amines are weaker bases than ammonia because the aryl group is:

  1. Electron releasing
  2. Electron neutralising
  3. Electron generating
  4. Electron withdrawing
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Correct answer: D. Electron withdrawing

1. The lone pair goes into conjugation with the ring. 2. It is then less available to take a proton. 3. The aryl group pulls electron density away. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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