Write an equation for the reaction of boron trifluoride, an ...

[Mr.Thesaxman]

Write an equation for the reaction of boron trifluoride, an important reagent in organic chemistry, with trimethylamine. Represent the movement of electrons with a curved arrow, and show the formal charges on the atoms in the product.
   
 

Question 2

Use the curved arrow method to show the electron movement, and label the acid, base, conjugate acid, and conjugate base.
   
   

Question 3

Identify the reactants and product in the reaction below as acids or bases and specify whether they are Lewis and/or Brnsted-Lowry.
   
 
 
 

Question 4

Which is the strongest base (pK_a values given for conjugate acid)?
  a.
  NH₃ (pK_a = 9.2)
   
  b.
  CH₃O^- (pK_a = 16)
   
  c.
  (pK_a = -6.5)
   
  d.
  CH₃CO₂^- (pK_a = 4.7)
   
  e.
  H^- (pK_a = 35)

Question 5

Draw a Lewis structure for each of the following.
   
  a)
  hydroxylammonium ion: ⁺NH₃OH.
   
   
  b)
  azide ion: (N₃^-)

Question 6

Of the bonds found in
   
 
   
  which is the most polar?
  a.
  C-F
  b.
  O-H
  c.
  C-H
  d.
  C-O

Question 7

Instructions: Indole is pleasant smelling in highly dilute solutions and has been used in perfumery. Use the structure of indole, below, to answer the following question(s).
   
 
  Refer to instructions. Indole can function as a Lewis base in the presence of strong acid. Formulate a reaction, using a generic acid (HA), showing electron flow with arrows, that demonstrates this reactivity of indole.

Question 8

Instructions: Indole is pleasant smelling in highly dilute solutions and has been used in perfumery. Use the structure of indole, below, to answer the following question(s).
   
 
  Refer to instructions. Indole can function as a Brnsted-Lowry acid in the presence of strong bases. Formulate a reaction, using a generic base (:B^-), showing electron flow with arrows, that demonstrates this reactivity of indole.

Question 9

Instructions: Consider the reaction below to answer the following question.
   
 
  Refer to instructions. Using the curved arrow formalism, show the flow of electrons for this reaction.

Question 10

Instructions: Consider the species below to answer the following question.
   
  BF₃
  Fe²⁺
 
 
  Refer to instructions. Which of the following would be common to all?
  a.
  Lewis acids
  b.
  Lewis bases
  c.
  Lewis acids or bases
  d.
  Neither Lewis acids nor bases

Question 11

Circle the Lewis bases in the group of compounds below.
   
 

Question 12

Instructions: Refer to the following equation to answer the question(s) below.
   
 
  Refer to instructions. Will this reaction take place as written in the forward direction? Explain.

Question 13

Instructions: Refer to the following equation to answer the question(s) below.
   
 
  Refer to instructions. The strongest Brnsted-Lowry base in the equation is indicated by letter _____.

Question 14

Instructions: Refer to the following equation to answer the question(s) below.
   
 
  Refer to instructions. The strongest Brnsted-Lowry acid in the equation is indicated by letter _____.

Question 15

Consider the structure of acetic acid shown below.
   
 
   
  In the electrostatic potential map of acetic acid, in which of the following bonds would the terminal atom appear as the deepest shade of red?
  a.
  C=O
  b.
  C-H
  c.
  C-C
  d.
  O-H

Question 16

The following shows an intermediate used in a Grignard synthesis. Which atom will inductively donate electrons in this species?
   
 
   
  a.
  C
  b.
  Br
  c.
  Mg
  d.
  H
  e.
  both b and c

Question 17

Refer to instructions. A C-O bond in tetrahydrofuran,
   
 

Question 18

Instructions: Use the convention d-/d+ and the crossed arrow () to show the direction of the expected polarity of the indicated bonds in the following compound(s).
  Refer to instructions. The C-F bond in fluorobenzene,
   
 

Question 19

In the two structures shown below, what do the positions labeled with the arrow have in common?
   
 
   
  a.
  the same type of hybridization on the carbon atom
  b.
  the same geometry around the carbon atom
  c.
  the same number of hydrogen atoms bonded to the carbon atom
  d.
  both carbon atoms are involved in a p bond

Question 20

Instructions: Consider the two structures below to answer the following question.
   
   CH₃CH₂OH CH₃OCH₃
  Refer to instructions. Which of the following correctly describes the structure of these compounds?
  a.
  All carbon atoms are sp³ hybridized.
  b.
  All of the bonds are sigma bonds.
  c.
  Each oxygen atom has two nonbonding pairs of electrons.
  d.
  The bond angle around each oxygen atom is ideally about 109.5.
  e.
  All of these

[akudia]

Answer to Question 1



Answer to Question 2



Answer to Question 3

base
acid
acid
(Lewis and BrnstedLowry)
(Lewis and BrnstedLowry)
(Lewis and BrnstedLowry)

Answer to Question 4

e

Answer to Question 5

a)


b)


Answer to Question 6

a

Answer to Question 7



Answer to Question 8



Answer to Question 9



Answer to Question 10

a

Answer to Question 11



Answer to Question 12

No, the reaction will not take place as written because the strongest acid reacts with the strongest base to give the weakest conjugate acid and the weakest conjugate base. D (pK_a = 15.7) is a stronger acid than A (pK_a = 18).

Answer to Question 13

c

Answer to Question 14

d

Answer to Question 15

a

Answer to Question 16

c

Answer to Question 17



Answer to Question 18



Answer to Question 19

c

Answer to Question 20

E