MCQOPTIONS
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MCQOPTIONS
This section includes 18 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. |
Ethene is devoid of any alpha hydrogen so hyperconjugation is not possible. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The compound that can be most readily sulphonated is __________ |
| A. | Benzene |
| B. | Toluene |
| C. | Nitrobenzene |
| D. | Chlorobenzene |
| Answer» C. Nitrobenzene | |
| 3. |
When the contributing structure contains the same number of two-electron bonds as the normal lewis formula, it will be __________ |
| A. | Heterovalent hyperconjugation |
| B. | Sacrificial hyperconjugation |
| C. | Isovalent hyperconjugation |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 4. |
On increasing the number of α-hydrogens, the number of hyperconjugation structures will __________ |
| A. | Decrease |
| B. | Increase |
| C. | Remains same |
| D. | None of the mentioned |
| Answer» C. Remains same | |
| 5. |
Larger the number of hyperconjugation structures, the stability of free radicals will __________ |
| A. | Increase |
| B. | Decrease |
| C. | Remains same |
| D. | None of the mentioned |
| Answer» B. Decrease | |
| 6. |
The resonance energy (kCal/mol) of tertiary butyl is __________ |
| A. | 9 |
| B. | 10 |
| C. | 11 |
| D. | 12 |
| Answer» E. | |
| 7. |
Number of hyperconjugation structures in isopropyl radical is __________ |
| A. | 3 |
| B. | 6 |
| C. | 9 |
| D. | 12 |
| Answer» C. 9 | |
| 8. |
Hyperconjugation involves the delocalisation of __________ |
| A. | σ bond orbital |
| B. | π bond orbital |
| C. | Both σ and π bond orbital |
| D. | None of the mentioned |
| Answer» B. π bond orbital | |
| 9. |
THE_COMPOUND_THAT_CAN_BE_MOST_READILY_SULPHONATED_IS?$ |
| A. | Benzene |
| B. | Toluene |
| C. | Nitrobenzene |
| D. | Chlorobenzene |
| Answer» C. Nitrobenzene | |
| 10. |
Ethene is devoid of any alpha hydrogen so hyperconjugation is not possible.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
When the contributing structure contains the same number of two-electron bonds as the normal lewis formula, it will b? |
| A. | Heterovalent hyperconjugation |
| B. | Sacrificial hyperconjugation |
| C. | Isovalent hyperconjugation |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 12. |
On increasing the number of α-hydrogens, the number of hyperconjugation structures will$ |
| A. | Decrease |
| B. | Increase |
| C. | Remains same |
| D. | None of the mentioned |
| Answer» C. Remains same | |
| 13. |
Which of the following is a consequence of Baker-Nathan effect? |
| A. | It is helpful in explaining the directive influence of alkyl groups in aromatic alkyl benzene |
| B. | It is helpful in explaining the relative stability of alkenes |
| C. | It is helpful in explaining the relative stabilities of alkyl carbocations |
| D. | All of the mentioned |
| Answer» E. | |
| 14. |
Larger the number of hyperconjugation structures, the stability of free radicals will |
| A. | Increase |
| B. | Decrease |
| C. | Remains same |
| D. | None of the mentioned |
| Answer» B. Decrease | |
| 15. |
The resonance energy (kCal/mol) of tertiary butyl is |
| A. | 9 |
| B. | 10 |
| C. | 11 |
| D. | 12 |
| Answer» E. | |
| 16. |
Number of hyperconjugation structures in isopropyl radical is |
| A. | 3 |
| B. | 6 |
| C. | 9 |
| D. | 12 |
| Answer» C. 9 | |
| 17. |
Hyperconjugation involves the delocalisation of |
| A. | σ bond orbital |
| B. | π bond orbital |
| C. | Both σ and π bond orbital |
| D. | None of the mentioned |
| Answer» B. ‚âà√¨‚àö√ë bond orbital | |
| 18. |
Which of the following is known as Baker-Nathan effect? |
| A. | Mesomeric effect |
| B. | Inductive effect |
| C. | Hyperconjugation |
| D. | Electromeric effect |
| Answer» D. Electromeric effect | |