MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following reaction sequence that will best carry out the following preparation? |
| A. | i I + MeONa + CH3H2Br ii) neutralize |
| B. | i) I + EtONa ii) CH3CH2Br iii) neutralize |
| C. | i) CH3CH2Br + Mg, Et2O ii) Add I iii) neutralize |
| D. | i) I + CH3CH2OH + Mg ii) neutralize |
| Answer» D. i) I + CH3CH2OH + Mg ii) neutralize | |
| 2. |
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» C. methyl acetate | |
| 3. |
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» C. ethyl formate | |
| 4. |
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» D. Ethyl alcohol | |
| 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» D. Methyl butanoate | |
| 6. |
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» C. Refluxing them with MgCl2 solution | |
| 7. |
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» C. methyl acetate | |
| 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» E. | |
| 9. |
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» C. ethyl formate | |
| 10. |
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» D. Ethyl alcohol | |
| 11. |
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» C. Grignard reagents are prepared in ether or tetrahydrofuran (THF) | |
| 12. |
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» E. | |
| 13. |
Which is not present in Grignard reagent? |
| A. | Methyl group |
| B. | Magnesium |
| C. | Halogen |
| D. | ‚àíCOOH group |
| Answer» E. | |
| 14. |
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 MgCl<sub>2</sub> solution |
| D. | Warming them with Mgcl<sub>2</sub> |
| Answer» C. Refluxing them with MgCl<sub>2</sub> solution | |