MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The rate of nucleophilic substitution reactions are higher in the presence of ___________ |
| A. | Electron withdrawing groups |
| B. | Electron releasing groups |
| C. | Both electron withdrawing and releasing groups |
| D. | None of the mentioned |
| Answer» B. Electron releasing groups | |
| 2. |
The nucleophilic substitutions do not occur in haloarenes because ___________ |
| A. | The carbon-halogen bond is much shorter |
| B. | The carbon-halogen bond is stronger compared to that in haloalkanes |
| C. | The lone pair of electrons on the halogen participates in delocalisation with the -electrons of benzene ring |
| D. | All of the mentioned |
| Answer» E. | |
| 3. |
Reaction of alcohol with SOCl2 is ___________ |
| A. | S<sub>N</sub>1 |
| B. | S<sub>N</sub>2 |
| C. | S<sub>N</sub>Ar |
| D. | S<sub>N</sub>i |
| Answer» E. | |
| 4. |
Arrange the following in the decreasing order of leaving group in nucleophilic substitution reaction. |
| A. | H<sup> </sup> > Cl<sup> </sup> > HO<sup> </sup> > Br<sup> </sup> > CH<sub>3</sub>COO<sup> </sup> |
| B. | Cl<sup> </sup> > Br<sup> </sup> > HO<sup> </sup> > H<sup> </sup> > CH<sub>3</sub>COO<sup> </sup> |
| C. | Cl<sup> </sup> > Br<sup> </sup> > CH<sub>3</sub>COO <sup> </sup> > HO<sup> </sup> > H<sup> </sup> |
| D. | HO<sup> </sup> > CH<sub>3</sub>COO <sup> </sup> > H<sup> </sup> > Br<sup> </sup> > Cl<sup> </sup> |
| Answer» D. HO<sup> </sup> > CH<sub>3</sub>COO <sup> </sup> > H<sup> </sup> > Br<sup> </sup> > Cl<sup> </sup> | |
| 5. |
Which of the following reactions are favoured by polar aprotic solvent? |
| A. | S<sub>N</sub>1 reactions |
| B. | S<sub>N</sub>2 reactions |
| C. | Both S<sub>N</sub>1 and S<sub>N</sub>1 reactions |
| D. | None of the mentioned |
| Answer» C. Both S<sub>N</sub>1 and S<sub>N</sub>1 reactions | |
| 6. |
A low concentration of nucleophile favours the ___________ |
| A. | S<sub>N</sub>2 reaction |
| B. | S<sub>N</sub>1 reaction |
| C. | Both S<sub>N</sub>1 and S<sub>N</sub>1 reaction |
| D. | None of the mentioned |
| Answer» C. Both S<sub>N</sub>1 and S<sub>N</sub>1 reaction | |
| 7. |
The reactivity order of alkyl halides in SN2 is ___________ |
| A. | CH<sub>3</sub> X > 1<sup>0</sup> > 2<sup>0</sup> > 3<sup>0</sup> |
| B. | CH<sub>3</sub> X > 2<sup>0</sup> > 1<sup>0</sup> > 3<sup>0</sup> |
| C. | CH<sub>3</sub> X > 3<sup>0</sup> > 1<sup>0</sup> > 2<sup>0</sup> |
| D. | CH<sub>3</sub> X > 3<sup>0</sup> > 2<sup>0</sup> > 1<sup>0</sup> |
| Answer» B. CH<sub>3</sub> X > 2<sup>0</sup> > 1<sup>0</sup> > 3<sup>0</sup> | |
| 8. |
When the nucleophile :OR attacks the RX, the resultant product will be ___________ |
| A. | R OH |
| B. | ROR |
| C. | R:CN |
| D. | RNHR |
| Answer» C. R:CN | |
| 9. |
The halide ion is an extremely ___________ |
| A. | Weak base |
| B. | Weak acid |
| C. | Strong base |
| D. | Strong acid |
| Answer» B. Weak acid | |
| 10. |
The functional group in alkyl halide is ___________ |
| A. | Hydroxyl group |
| B. | Halogen atom |
| C. | Inert gas |
| D. | All of the mentioned |
| Answer» C. Inert gas | |
| 11. |
The atom which defines the structure of a family of organic compounds and their properties is called ___________ |
| A. | Resonating structure |
| B. | Homologous structure |
| C. | Functional group |
| D. | Nucleophile |
| Answer» D. Nucleophile | |