MCQOPTIONS
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MCQOPTIONS
This section includes 17 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. |
Which of the following free radical has the maximum ease of formation? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | CH3 |
| Answer» D. CH3 | |
| 2. |
The homolytic bond dissociation energy is inversely proportional to the __________ |
| A. | Bond length |
| B. | Ease of formation |
| C. | Dipole moment |
| D. | All of the mentioned |
| Answer» C. Dipole moment | |
| 3. |
The formal charge at the carbocation is equal to __________ |
| A. | -1 |
| B. | 0 |
| C. | +1 |
| D. | +2 |
| Answer» D. +2 | |
| 4. |
Positive charge of carbocations can be dispersed by __________ |
| A. | (+I) effect of alkyl group |
| B. | Resonance in allyl or benzyl carbocation |
| C. | Hyperconjugation in 10, 20 and 30 carbocations |
| D. | All of the mentioned |
| Answer» E. | |
| 5. |
The shape of carbocation is __________ |
| A. | Pyramidal |
| B. | Bent |
| C. | Linear |
| D. | Trigonal planar |
| Answer» E. | |
| 6. |
The hybridisation of carbocation is __________ |
| A. | Sp |
| B. | Sp2 |
| C. | Sp3 |
| D. | Sp3d |
| Answer» C. Sp3 | |
| 7. |
Stability of free radicals can be explained on the basis of __________ |
| A. | Inductive effect |
| B. | Electromeric effect |
| C. | Hyperconjugation |
| D. | Mesomeric effect |
| Answer» D. Mesomeric effect | |
| 8. |
WHICH_OF_THE_FOLLOWING_FREE_RADICAL_HAS_THE_MAXIMUM_EASE_OF_FORMATION??$ |
| A. | 1<sup>0</sup> |
| B. | 2<sup>0</sup> |
| C. | 3<sup>0</sup> |
| D. | CH<sub>3</sub> |
| Answer» D. CH<sub>3</sub> | |
| 9. |
THE_HOMOLYTIC_BOND_DISSOCIATION_ENERGY_IS_INVERSELY_PROPORTIONAL_TO_THE?$ |
| A. | Bond length |
| B. | Ease of formation |
| C. | Dipole moment |
| D. | All of the mentioned |
| Answer» C. Dipole moment | |
| 10. |
The formal charge at the carbocation is equal t? |
| A. | -1 |
| B. | 0 |
| C. | +1 |
| D. | +2 |
| Answer» D. +2 | |
| 11. |
Alkyl substitution at the carbon bearing positive charge stabilizes carbocations. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Positive charge of carbocations can be dispersed by |
| A. | (+I) effect of alkyl group |
| B. | Resonance in allyl or benzyl carbocation |
| C. | Hyperconjugation in 1<sup>0</sup>, 2<sup>0</sup> and 3<sup>0</sup> carbocations |
| D. | All of the mentioned |
| Answer» E. | |
| 13. |
Carbonium ions are the intermediates in which the positive charge is carried by the carbon atom with ___________ electrons in the valence shell. |
| A. | 6 |
| B. | 5 |
| C. | 4 |
| D. | 3 |
| Answer» B. 5 | |
| 14. |
The shape of carbocation is |
| A. | Pyramidal |
| B. | Bent |
| C. | Linear |
| D. | Trigonal planar |
| Answer» E. | |
| 15. |
Arrange the following carbocations in the order of increasing stability. |
| A. | Benzyl > 3<sup>0</sup> > 2<sup>0</sup> > 1<sup>0</sup> |
| B. | Benzyl > 1<sup>0</sup> > 2<sup>0</sup> > 3<sup>0</sup> |
| C. | 3<sup>0</sup> > 2<sup>0</sup> > 1<sup>0</sup> > Benzyl |
| D. | 1<sup>0</sup> > 2<sup>0</sup> > 3<sup>0</sup> > Benzyl |
| Answer» B. Benzyl > 1<sup>0</sup> > 2<sup>0</sup> > 3<sup>0</sup> | |
| 16. |
The hybridisation of carbocation is |
| A. | Sp |
| B. | Sp<sup>2</sup> |
| C. | Sp<sup>3</sup> |
| D. | Sp<sup>3</sup>d |
| Answer» C. Sp<sup>3</sup> | |
| 17. |
Stability of free radicals can be explained on the basis of |
| A. | Inductive effect |
| B. | Electromeric effect |
| C. | Hyperconjugation |
| D. | Mesomeric effect |
| Answer» D. Mesomeric effect | |