Organic Chemistry Questions and Answers – Grignard Reagent | Organic Chemistry Multiple Choice Questions and Answers

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Questions
1 Alkyl halides can be converted into Grignard reagents by _______________
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

Answer: Warming them with magnesium powder in dry ether
2 Which is not present in Grignard reagent?
A Methyl group
B Magnesium
C Halogen
D −COOH group

Answer: −COOH group
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3 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

Answer: 4-heptanone
4 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

Answer: An organosodium compound is not very reactive compared to a Grignard reagent
5 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

Answer: Pentanal
6 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

Answer:Ethyl iodide
7 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

Answer: ethylene oxide
8 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

Answer: Oxirane
9 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

Answer: acetaldehyde
10 Which of the following reaction sequence that will best carry out the following preparation?

Organic Chemistry

A a) i I + MeONa + CH3H2Br ii) neutralize
B b) i) I + EtONa ii) CH3CH2Br iii) neutralize
C c) i) CH3CH2Br + Mg, Et2O ii) Add I iii) neutralize
D d) i) I + CH3CH2OH + Mg ii) neutralize

Answer:c) i) CH3CH2Br + Mg, Et2O ii) Add I iii) neutralize

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