Chapter 15 Organometallic Compounds

Question 1

What term describes the process whereby an alkyl halide undergoes reaction with magnesium metal to give an alkylmagnesium bromide (Grignard reagent)?

a. nucleophilic substitution
b. electrophilic addition
c. oxidative addition
d. reductive elimination

Answer 1

c. oxidative addition

Question 2

What is the change in oxidation state of the metal when magnesium reacts with an alkyl bromide to give an alkylmagnesium bromide (Grignard reagent)?

a. 0 to +1
b. 0 to +2
c. 0 to -1
d. 0 to -2

Answer 2

b. 0 to +2

Question 3

Which of the following is the best choice of solvent for the formation of phenylmagnesium bromide by the reaction of bromobenzene with magnesium?

a. water
b. methanol
c. diethyl ether
d. acetic acid

Answer 3

c. diethyl ether

Question 4

Which of the following is the best choice of solvent for the formation of phenyllithium by the reaction
of bromobenzene with lithium?
a. water
b. ethanol
c. tetrahydrofuran
d. acetic acid

Answer 4

c. tetrahydrofuran

Question 5

Which of the following bonds has the most ionic character?

a. CAl
b. CHg
c. CMg
d. CZn

Answer 5

c. CMg

Question 6

Which of the following bonds has the most ionic character?

a. CSn
b. CCu
c. CZn
d. CLi

Answer 6

d. CLi

Question 7

Which of the following compounds is the strongest base?

a. CH3CH2MgBr
b. CH3CH2OH
c. CH3CH2OMgBr
d. CH3CH3

Answer 7

a. CH3CH2MgBr

Question 8

Which of the following compounds is the strongest base?

a. NaOH
b. NH3
c. CH3Li
d. CH3OH

Answer 8

c. CH3Li

Question 9

Which of the following molecules are deprotonated by ethylmagnesium bromide?

a. phenol, PhOH
b. propyne, CH3C(triple bond)CH
c. dimethylamine, (CH3)2NH
d. all of these

Answer 9

d. all of these