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ISC Class 12 Amines and Biomolecules — practice questions — page 2

Explore 108 free Amines and Biomolecules questions in ISC Class 12 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 108.

Lower aliphatic amines dissolve in water because they form:Read the answer and worked solution →Which class of amine has no intermolecular hydrogen bonding?Read the answer and worked solution →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 →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 →Benzenediazonium chloride is made from aniline and nitrous acid at: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 →Nitriles reduced with lithium aluminium hydride give:Read the answer and worked solution →Lower aliphatic amines are gases carrying a smell that is:Read the answer and worked solution →Aniline is a resonance hybrid of how many structures?Read the answer and worked solution →Amines are best regarded as derivatives of:Read the answer and worked solution →The geometry around nitrogen in an amine molecule is:Read the answer and worked solution →The C to N to E angle in an amine is less than:Read the answer and worked solution →In the IUPAC system primary amines are named as:Read the answer and worked solution →Nitro compounds are reduced to amines by hydrogen over:Read the answer and worked solution →Reduction of nitro compounds with iron scrap uses which acid?Read the answer and worked solution →Reduction of a nitrile gives an amine with how many more carbons?Read the answer and worked solution →Does it react with a primary amine only?Read the answer and worked solution →Fill the gaps on amine chemistryRead the answer and worked solution →Pick the right answer, quicklyRead the answer and worked solution →Ammonolysis of alkyl halides is carried out in a sealed tube 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 →Insulin and albumin are examples of which class of protein?Read the answer and worked solution →Oxidation of glucose with nitric acid gives:Read the answer and worked solution →Enzymes speed a reaction by lowering its:Read the answer and worked solution →

Worked practice questions

Lower aliphatic amines dissolve in water because they form:

  1. Hydrated anions
  2. Hydrogen halides
  3. Hydrolysed esters
  4. Hydrogen bonds
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Correct answer: D. Hydrogen bonds

1. The nitrogen lone pair meets the water molecule. 2. A bond forms between them. 3. That hydrogen bonding carries the amine into solution. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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Which class of amine has no intermolecular hydrogen bonding?

  1. Tertiary
  2. Secondary
  3. Primary
  4. Aromatic
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Correct answer: A. Tertiary

1. Hydrogen bonding needs a hydrogen on the nitrogen. 2. A tertiary amine has all three positions taken by groups. 3. So no such hydrogen is left. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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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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