MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 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 are incorrect statement? |
| A. | X being electronegative, makes the H (on C-2) more acidic |
| B. | Due to electron withdrawal nature of X, it stabilises the carbanion |
| C. | (X) destabilises the carbanion due to the presence of lone pairs |
| D. | The reaction proceeds by an E1CB pathway |
| Answer» D. The reaction proceeds by an E1CB pathway | |
| 2. |
Which of the following compounds cannot give E1CB reaction? |
| A. | CF3 – CHCl2 |
| B. | C6h5 – CH2 – CH2F |
| C. | CH3 – CH2 – CH2Br |
| D. | |
| Answer» E. | |
| 3. |
In which reaction product formation takes place by hoffmann rule? |
| A. | I and II |
| B. | II and III |
| C. | I, II and III |
| D. | I, II, III and IV |
| Answer» E. | |
| 4. |
Which incorrect about alkyl bromide having molecular formula C5H11Br? |
| A. | One isomeric alkyl bromide undergoes E1 elimination at the fastest rate |
| B. | Only one is incapable of reacting by the E2 mechanism |
| C. | Only one isomer gives a single alkene on E2 elimination |
| D. | 2-Bromopentane gives the most complex mixture of alkenes on E2 elimination |
| Answer» D. 2-Bromopentane gives the most complex mixture of alkenes on E2 elimination | |
| 5. |
Which of the following statement (s) is/are true about the following eliminations?(1) Hoffmann product is major product in I (2) Saytzeff product is major product in I (3) Hoffmann product is major product in II (4) Saytzeffproduct is major product in II |
| A. | 1 and 2 |
| B. | 1 and 4 |
| C. | 2 and 3 |
| D. | 3 and 4 |
| Answer» C. 2 and 3 | |
| 6. |
Which of the following statement is correct regarding the following reaction? |
| A. | Major product is endocyclic alkene formed according to Saytzeff |
| B. | Major product is exocyclic alkene formed according to Saytzeff |
| C. | Major product is exocyclic alkene formed according to Hoffmann |
| D. | Major product is endocyclic alkene formed according to Hoffmann |
| Answer» D. Major product is endocyclic alkene formed according to Hoffmann | |
| 7. |
Which of the following is incorrect statement for the giver reaction? |
| A. | Rate of formation of II and IV would be identical |
| B. | Rate of formation of I would be slower than that of III |
| C. | Formation of I would show primary isotope effect |
| D. | Formation of III involves E1 reaction |
| Answer» E. | |
| 8. |
Assuming both the reactions as E1, where will the expected ratio between KH/KD lies between? |
| A. | nearly I |
| B. | nearly 3 |
| C. | nearly 5 |
| D. | anything in between 2 and 8 |
| Answer» B. nearly 3 | |
| 9. |
WHICH_INCORRECT_ABOUT_ALKYL_BROMIDE_HAVING_MOLECULAR_FORMULA_C5H11BR??$ |
| A. | One isomeric alkyl bromide undergoes E1 elimination at the fastest rate |
| B. | Only one is incapable of reacting by the E2 mechanism |
| C. | Only one isomer gives a single alkene on E2 elimination |
| D. | 2-Bromopentane gives the most complex mixture of alkenes on E2 elimination |
| Answer» D. 2-Bromopentane gives the most complex mixture of alkenes on E2 elimination | |
| 10. |
Which of the following order is incorrect for the rate of E2 reaction? |
| A. | 5-Bromocycloheptene > 4-Bromocycloheptene |
| B. | 2-Bromo- I -phenylbutane > 3-Bromo- I-phenylbutane |
| C. | 3-Bromocyclohexene > Bromocyclohexane |
| D. | 3-Bromo-2-methylpentane > 2-Bromo-4-methylpentane |
| Answer» B. 2-Bromo- I -phenylbutane > 3-Bromo- I-phenylbutane | |
| 11. |
Which of the following statements is correct for alkyl halide? |
| A. | Alkyl halide will always show S<sub>N</sub>1 mechanism |
| B. | As branching at carbon increases, E1 mechanism is favoured as compared to S<sub>N</sub>1 mechanism |
| C. | In unimolecular reaction, increasing the temperature donot favours E1 mechanism |
| D. | In most unimolecular reactions of alkyl halide E1 reaction is favoured over SN1 reaction |
| Answer» C. In unimolecular reaction, increasing the temperature donot favours E1 mechanism | |