B.Sc. Third year Undergraduate degree course Semester Fifth Organic chemistry
Chapter - Organometallic Compounds
Organometallic
Compounds
Organomagnesium - compounds: Alkyl Magnesium halides-ethyl
magnesium bromide formation, structure and chemical reactions. Organozinc
compound dialkyl zinc formation and chemical reactions, organolithium compound-
nbutyllithium formation and chemical reactions.
Multiple Choice questions
1. Organometallic compounds for synthetic purposes have been used as organomagnesium halides also called….a) Millers reagent
b) Grignard reagent
c) Tollens reagent
d) None of these
a) CH3CH2CH2OH
b) CH3CH2OH
c) CH3OH
d) CH3CHO
a) Magnesium salt of a carboxylic acid
b) CH3CH2OH
c) CH3CHO
d) None of these
a) Boiling them with Mg ribbon in alcoholic solution
b) Warming them with magnesium powder in dry ether
c) Refluxing them with MgCl2 solution
d) Warming them with Mgcl2
5. Which is not present in Grignard reagent?
a) Methyl group
b) Magnesium
c) Halogen
d) −COOH group
6. Which of the following compounds does not give a tertiary alcohol upon reaction with methylmagnesium bromide?
a) 3-methylpentanal
b) Ethyl benzoate
c) 4,4-dimethylcyclohexanone
d) 4-heptanone
7. Which of the following statements about Grignard reagent is false?
a) Grignard reagents (RMgBr) add to the carbonyl group of aldehydes and ketones
b) An organosodium compound is not very reactive compared to a Grignard reagent
c) Grignard reagents are prepared in ether or tetrahydrofuran (THF)
d) Grignard reagents are decomposed by water and alcohol
8. Which of the following compounds gives a secondary alcohol upon reaction with methylmagnesium bromide?
a) Butyl formate
b) 3- pentanone
c) Pentanal
d) Methyl butanoate
9. A Grignard’s reagent may be made by reacting magnesium with which of the following compound?
a) Methyl amine
b) Diethyl ether
c) Ethyl iodide
d) Ethyl alcohol
10. Which of the following compounds gives a primary alcohol upon reaction with phenylmagnesium bromide?
a) 2-methyloxirane
b) ethylene oxide
c) ethyl formate
d) carbon dioxide
11. Which of the following reagents, when treated with phenylmagnesiuim bromide followed by acid workup, will yield 2-phenylethanol?
a) Ethanol
b) Diethyl ether
c) Ethanal
d) Oxirane
12. Which of the following compounds would not give tert-butyl alcohol when treated with excess methylmagnesium bromide?
a) acetyl chloride
b) acetaldehyde
c) methyl acetate
d) acetic anhydride
13. Organozinc reagent is also known as…
a) Reformatsky enolate
b) Grignard reagent
c) Tollens reagent
d) None of these
a) Diorganozinc
b) Organozinc halides
c) Metal zincates
d) All of these
a) Reformatsky reaction
b) Simmons smith reaction
c) Both a and b
d) None of these
b) Simmons smith reaction
c) Both a and b
d) None of these
b) Simmons smith reaction
c) Both a and b
d) None of these
a) Methyl hexane
b) Methyl ethyl Lithium
c) Methyl lithium
d) All of these
a) Ethane and Lithium hydroxide
b) Methane and Lithium hydroxide
c) Butane and Lithium hydroxide
d) All of these
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