Organic Chemistry Multiple Choice Questions and Answers

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

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