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CUET UG Amines and Biomolecules — practice questions

Explore 168 free Amines and Biomolecules questions in CUET UG 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 1–30 of 168.

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 →Ammonolysis of alkyl halides is carried out in a sealed tube at:Read the answer and worked solution →The chief drawback of ammonolysis is that it yields a:Read the answer and worked solution →In ammonolysis the order of reactivity of alkyl halides is:Read the answer and worked solution →Nitriles reduced with lithium aluminium hydride give:Read the answer and worked solution →Reduction of a nitrile gives an amine with how many more carbons?Read the answer and worked solution →Gabriel phthalimide synthesis is used to prepare only:Read the answer and worked solution →Aromatic primary amines cannot be made by Gabriel synthesis because:Read the answer and worked solution →Hoffmann bromamide degradation treats an amide with bromine and:Read the answer and worked solution →The amine from Hoffmann degradation has how many carbons?Read the answer and worked solution →Lower aliphatic amines are gases carrying a smell that is:Read the answer and worked solution →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 →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 →

Worked practice questions

Amines are best regarded as derivatives of:

  1. Ammonia
  2. Methane
  3. Benzene
  4. Ethanol
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Correct answer: A. Ammonia

1. One, two or all three hydrogen atoms are replaced. 2. The replacing groups are alkyl or aryl. 3. The parent molecule left behind is ammonia. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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The geometry around nitrogen in an amine molecule is:

  1. Pyramidal
  2. Octahedral
  3. Tetrahedral
  4. Square planar
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Correct answer: A. Pyramidal

1. The nitrogen orbitals are sp3 hybridised. 2. Three orbitals bond and the fourth holds a lone pair. 3. That arrangement leaves the shape pyramidal. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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The C to N to E angle in an amine is less than:

  1. 125.5 degrees
  2. 109.5 degrees
  3. 170.5 degrees
  4. 140.5 degrees
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Correct answer: B. 109.5 degrees

1. A perfect sp3 centre would give 109.5 degrees. 2. The lone pair squeezes the bonds together. 3. So the observed angle falls below that value. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_

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