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 cannot react as a nucleophile? |
| A. | CH3NH2 |
| B. | (CH3)2NH |
| C. | (CH3)3N |
| D. | (CH3)4N+ |
| Answer» E. | |
| 2. |
Which halide ion is the best nucleophile in dimethyl sulfoxide solution? |
| A. | I– |
| B. | F– |
| C. | Cl– |
| D. | Br– |
| Answer» C. Cl– | |
| 3. |
Which of the following statements is true about the following two anionic molecules? |
| A. | I is more basic and more nucleophilic than II |
| B. | I is less basic and less nucleophilic than II |
| C. | I is more basic but less nucleophilic than II |
| D. | I is less basic but more nucleophilic than II |
| Answer» D. I is less basic but more nucleophilic than II | |
| 4. |
What will be the number of products (excluding stereoisomers) in the given reaction? C6H5CHO + CH3-CHO + NaOH → Product |
| A. | One |
| B. | Three |
| C. | Two |
| D. | Four |
| Answer» D. Four | |
| 5. |
Which of the following nucleophile can be used for partial enolization 1,3-Dicarbonyl compound?a) Lithium di-isopropyl amide (LD |
| A. | Lithium di-isopropyl amide (LDA) |
| B. | Et-O– |
| C. | Weak base like NaOH |
| D. | Sodium acetate |
| Answer» E. | |
| 6. |
Which of the following is not true about nucleophile? |
| A. | donates an electron pair to an electrophile to form a chemical bond |
| B. | all molecules or ions with a free pair of electrons or at least one pi bond can act as nucleophiles |
| C. | nucleophile are Lewis acids by definition |
| D. | a nucleophile becomes attracted to a full or partial positive charge |
| Answer» D. a nucleophile becomes attracted to a full or partial positive charge | |
| 7. |
WHICH_HALIDE_ION_IS_THE_BEST_NUCLEOPHILE_IN_DIMETHYL_SULFOXIDE_SOLUTION??$ |
| A. | I<sup>–</sup> |
| B. | F<sup>–</sup> |
| C. | Cl<sup>–</sup> |
| D. | Br<sup>–</sup> |
| Answer» C. Cl<sup>‚Äö√Ñ√∂‚àö√ë‚àö¬®</sup> | |
| 8. |
Which of the following cannot react as a nucleophile?$ |
| A. | CH<sub>3</sub>NH<sub>2</sub> |
| B. | (CH<sub>3</sub>)<sub>2</sub>NH |
| C. | (CH<sub>3</sub>)<sub>3</sub>N |
| D. | (CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup> |
| Answer» E. | |
| 9. |
Which of the following statements is true about ammonia and water? |
| A. | ammonia is more basic and more nucleophilic than water |
| B. | ammonia is less basic and less nucleophilic than water |
| C. | ammonia is more basic but less nucleophilic than water |
| D. | ammonia is less basic but more nucleophilic than water |
| Answer» B. ammonia is less basic and less nucleophilic than water | |
| 10. |
Which reagent is a good nucleophile? |
| A. | NH<sub>3</sub> |
| B. | BH<sub>3</sub> |
| C. | Br<sub>2</sub> |
| D. | HBr |
| Answer» B. BH<sub>3</sub> | |
| 11. |
What will be the number of products (excluding stereoisomers) in the given reaction? |
| A. | |
| B. | One |
| C. | Three |
| Answer» D. | |
| 12. |
Which of the following nucleophile can be used for partial enolization 1,3-Dicarbonyl compound? |
| A. | Lithium di-isopropyl amide (LDA) |
| B. | Et-O<sup>–</sup> |
| C. | Weak base like NaOH |
| D. | Sodium acetate |
| Answer» E. | |
| 13. |
Which halogen nucleophile is weakest in polar, aprotic solvents? |
| A. | I<sup>–</sup> |
| B. | F<sup>–</sup> |
| C. | Cl<sup>–</sup> |
| D. | Br<sup>–</sup> |
| Answer» B. F<sup>‚Äö√Ñ√∂‚àö√ë‚àö¬®</sup> | |
| 14. |
Which of the following is not true about nucleophile? |
| A. | donates an electron pair to an electrophile to form a chemical bond |
| B. | all molecules or ions with a free pair of electrons or at least one pi bond can act as nucleophiles |
| C. | nucleophile are Lewis acids by definition |
| D. | a nucleophile becomes attracted to a full or partial positive charge |
| Answer» D. a nucleophile becomes attracted to a full or partial positive charge | |