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CUET UG Chemistry — practice by topic

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Amines and Biomolecules (168)

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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 →

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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