Amines
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Questions and Answers

What is the approximate C-N-H angle in amines?

  • 107 degrees (correct)
  • 90 degrees
  • 109 degrees
  • 120 degrees

    • What is the primary method of preparing primary amines from halogenoalkanes?

  • Heating with lithium aluminium hydride
  • Reduction with sodium borohydride
  • Treatment with phthalimide
  • Heating with concentrated ammonia in ethanol (correct)

    • What is the pKa value of primary and secondary amines?

  • 10
  • 38 (correct)
  • 4
  • 20

    • Which type of amine does not possess a degree of acidity?

    <p>Tertiary amine</p> Signup and view all the answers

    What is the main application of Gabriel phthalimide synthesis?

    <p>Preparation of primary amines easily</p> Signup and view all the answers

    What is the characteristic of an aqueous solution of an amine?

    <p>Strongly alkaline</p> Signup and view all the answers

    What is the result of replacing one or more hydrogen atoms of ammonia with an alkyl group?

    <p>Derivation of an amine</p> Signup and view all the answers

    What is the hybridization of nitrogen in amines according to VSEPR theory?

    <p>sp3 hybridized</p> Signup and view all the answers

    What type of compounds are formed when a nitrogen atom is connected to a carbonyl group?

    <p>Amides</p> Signup and view all the answers

    How many valence electrons does a nitrogen atom have?

    <p>5 valence electrons</p> Signup and view all the answers

    What is the general structure of most sp3 hybridized molecules?

    <p>Tetrahedral</p> Signup and view all the answers

    What is the characteristic shape of amines due to the presence of a lone pair?

    <p>Pyramidal</p> Signup and view all the answers

    What is the primary difference between amides and amines?

    <p>Presence of a carbonyl group</p> Signup and view all the answers

    How do amines resemble ammonia structurally?

    <p>Nitrogen can bond up to 3 hydrogen atoms</p> Signup and view all the answers

    What is the reason for the pyramidal shape of amines?

    <p>Presence of a lone pair</p> Signup and view all the answers

    What is the result of replacing one or more hydrogen atoms of ammonia with an aryl group?

    <p>Formation of arylamine</p> Signup and view all the answers

    What is the characteristic of the nitrogen atom in amines?

    <p>It is trivalent with a lone pair</p> Signup and view all the answers

    What is the term used to describe amines derived from ammonia, where one or more hydrogen atoms are replaced by an alkyl or aryl group?

    <p>Alkylamine and arylamine</p> Signup and view all the answers

    What is the primary reason for the difference in the C-N-H angle of amines compared to tetrahedral geometry?

    <p>The presence of a lone pair on the nitrogen atom</p> Signup and view all the answers

    Which of the following methods is used to prepare primary amines that contain one carbon atom more than the starting amine?

    <p>Reduction of nitriles with lithium aluminium hydride</p> Signup and view all the answers

    What is the characteristic of the acidity of primary and secondary amines?

    <p>They are weak acids</p> Signup and view all the answers

    Why are aryl halides not used in the Gabriel phthalimide synthesis?

    <p>They do not undergo nucleophilic substitution with the anion formed by phthalimide</p> Signup and view all the answers

    What is the reason for the strong alkalinity of an aqueous solution of an amine?

    <p>The high pKb value of amines</p> Signup and view all the answers

    What is the key difference between the preparation of primary amines from halogenoalkanes and the reduction of nitriles?

    <p>The type of reactants used</p> Signup and view all the answers

    What is the characteristic of the nitrogen atom in amines?

    <p>Having a lone pair</p> Signup and view all the answers

    What is the type of compounds formed when a nitrogen atom is connected to a carbonyl group?

    <p>Amide</p> Signup and view all the answers

    How do amines differ from ammonia structurally?

    <p>Amines have one or more hydrogen atoms replaced by an alkyl or aryl group</p> Signup and view all the answers

    What is the shape of amines due to the presence of a lone pair?

    <p>Pyramidal</p> Signup and view all the answers

    What is the result of replacing one or more hydrogen atoms of ammonia with an alkyl group?

    <p>Formation of an alkylamine</p> Signup and view all the answers

    What is the hybridization of nitrogen in amines according to VSEPR theory?

    <p>sp3</p> Signup and view all the answers

    What is the primary reason for the difference in the C-N-H angle of amines compared to tetrahedral geometry?

    <p>The presence of a lone pair</p> Signup and view all the answers

    What is the main application of amines?

    <p>All of the above</p> Signup and view all the answers

    What is the result of heating haloalkanes with a concentrated solution of ammonia in ethanol?

    <p>Formation of a salt</p> Signup and view all the answers

    What is the pKb value of primary and secondary amines?

    <p>4</p> Signup and view all the answers

    What is the limitation of the Gabriel phthalimide synthesis?

    <p>It cannot be used to prepare aromatic primary amines</p> Signup and view all the answers

    What is the type of amines that can be prepared by the reduction of nitriles?

    <p>Primary amines with one carbon atom more than the starting amine</p> Signup and view all the answers

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