36 Questions
What is the approximate C-N-H angle in amines?
107 degrees
What is the primary method of preparing primary amines from halogenoalkanes?
Heating with concentrated ammonia in ethanol
What is the pKa value of primary and secondary amines?
38
Which type of amine does not possess a degree of acidity?
Tertiary amine
What is the main application of Gabriel phthalimide synthesis?
Preparation of primary amines easily
What is the characteristic of an aqueous solution of an amine?
Strongly alkaline
What is the result of replacing one or more hydrogen atoms of ammonia with an alkyl group?
Derivation of an amine
What is the hybridization of nitrogen in amines according to VSEPR theory?
sp3 hybridized
What type of compounds are formed when a nitrogen atom is connected to a carbonyl group?
Amides
How many valence electrons does a nitrogen atom have?
5 valence electrons
What is the general structure of most sp3 hybridized molecules?
Tetrahedral
What is the characteristic shape of amines due to the presence of a lone pair?
Pyramidal
What is the primary difference between amides and amines?
Presence of a carbonyl group
How do amines resemble ammonia structurally?
Nitrogen can bond up to 3 hydrogen atoms
What is the reason for the pyramidal shape of amines?
Presence of a lone pair
What is the result of replacing one or more hydrogen atoms of ammonia with an aryl group?
Formation of arylamine
What is the characteristic of the nitrogen atom in amines?
It is trivalent with a lone pair
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?
Alkylamine and arylamine
What is the primary reason for the difference in the C-N-H angle of amines compared to tetrahedral geometry?
The presence of a lone pair on the nitrogen atom
Which of the following methods is used to prepare primary amines that contain one carbon atom more than the starting amine?
Reduction of nitriles with lithium aluminium hydride
What is the characteristic of the acidity of primary and secondary amines?
They are weak acids
Why are aryl halides not used in the Gabriel phthalimide synthesis?
They do not undergo nucleophilic substitution with the anion formed by phthalimide
What is the reason for the strong alkalinity of an aqueous solution of an amine?
The high pKb value of amines
What is the key difference between the preparation of primary amines from halogenoalkanes and the reduction of nitriles?
The type of reactants used
What is the characteristic of the nitrogen atom in amines?
Having a lone pair
What is the type of compounds formed when a nitrogen atom is connected to a carbonyl group?
Amide
How do amines differ from ammonia structurally?
Amines have one or more hydrogen atoms replaced by an alkyl or aryl group
What is the shape of amines due to the presence of a lone pair?
Pyramidal
What is the result of replacing one or more hydrogen atoms of ammonia with an alkyl group?
Formation of an alkylamine
What is the hybridization of nitrogen in amines according to VSEPR theory?
sp3
What is the primary reason for the difference in the C-N-H angle of amines compared to tetrahedral geometry?
The presence of a lone pair
What is the main application of amines?
All of the above
What is the result of heating haloalkanes with a concentrated solution of ammonia in ethanol?
Formation of a salt
What is the pKb value of primary and secondary amines?
4
What is the limitation of the Gabriel phthalimide synthesis?
It cannot be used to prepare aromatic primary amines
What is the type of amines that can be prepared by the reduction of nitriles?
Primary amines with one carbon atom more than the starting amine
Learn about amines, a crucial class of organic compounds derived from ammonia. Understand the structure and properties of amines, including their functional group and bonding characteristics.
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