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Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079

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Section
BuyFindarrow_forward

Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079
Textbook Problem

The basic properties of amines are related to

  1. a. the presence of a hydroxyl group on the nitrogen atom
  2. b. the presence of an unshared pair of electrons on the nitrogen atom
  3. c. the ability of the nitrogen atom to lose hydrogen atoms
  4. d. no correct response

Interpretation Introduction

Interpretation:

Basic property of amines is related to which among the given options has to be chosen.

Concept Introduction:

Amines are a class of organic compounds.  They are derivatives of ammonia.  Similar to the nitrogen atom in ammonia, the amine nitrogen also has a lone pair of electrons on it.  This means that amines can act as proton acceptors.  When an amine is added to water a proton is transferred to the nitrogen atom.  The resulting solution is a basic solution.  This contains ammonium ions and hydroxide ions.

Substituted ammonium ion is the one in which one or more alkyl, aryl, or cycloalkyl groups are substituted instead of hydrogen atoms.  There are two important generalizations that is applied to the substituted ammonium ion and they are,

  • Substituted ammonium ions are not neutral molecules.  They are charged species.
  • Nitrogen atom has four bonds in ammonium ion or substituted ammonium ion.  The species is positively charged as the fourth bond formed is a coordinate covalent bond.
Explanation

Reason for correct option:

Amines have a polar amino functional group.  This has a nitrogen atom.  Lone pair of electrons are present on nitrogen atom.  This can act as a proton acceptor to form a basic solution.  The basic solution consists of ammonium ion and hydroxide ions.  The basic property of amines is related to the unshared pair of electrons that is present on the nitrogen atom.

Hence, option (b) is a correct one.

Reason for incorrect option:

Option (a) tells that the presence of hydroxyl group on the nitrogen atom is the reason for basic properties of amines...

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