MCQOPTIONS
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MCQOPTIONS
This section includes 23 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. |
Potential energy remains same during the rotation about the carbon-carbon of n-butane. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Which of the following is least stable? |
| A. | Anti conformation |
| B. | Gauche conformation |
| C. | Staggered conformation |
| D. | Eclipsed conformation |
| Answer» E. | |
| 3. |
Gauche conformation is less stable due to _______________ |
| A. | Hydrogen bonding |
| B. | Covalent bonding |
| C. | Vander Waal’s repulsion |
| D. | Torsional strain |
| Answer» D. Torsional strain | |
| 4. |
Both anti and gauche conformations are free of torsional strain. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
In gauche conformations, the methyl groups are ___________ |
| A. | 600 apart |
| B. | 900 apart |
| C. | 1800 apart |
| D. | 3600 apart |
| Answer» B. 900 apart | |
| 6. |
The relative instability of any of the intermediate skew conformations is due to ___________ |
| A. | Lateral strain |
| B. | Shear strain |
| C. | Longitudinal strain |
| D. | Torsional strain |
| Answer» E. | |
| 7. |
The potential energy of n-butane is maximum for ___________ |
| A. | Skew conformations |
| B. | Staggered conformations |
| C. | Eclipsed conformations |
| D. | Gauche |
| Answer» D. Gauche | |
| 8. |
The potential energy of n-butane is minimum for ___________ |
| A. | Skew conformations |
| B. | Staggered conformations |
| C. | Eclipsed conformations |
| D. | Gauche |
| Answer» C. Eclipsed conformations | |
| 9. |
The infinity of intermediate conformations are called ___________ |
| A. | Skew conformations |
| B. | Staggered conformations |
| C. | Eclipsed conformations |
| D. | Gauche |
| Answer» B. Staggered conformations | |
| 10. |
The rotation about the (C2 – C3) carbon-carbon bond of n-butane requires the energy of about ___________ |
| A. | 100 kJ/mol |
| B. | 50 kJ/mol |
| C. | 10 kJ/mol |
| D. | 3 kJ/mol |
| Answer» E. | |
| 11. |
The energy required to rotate n-butane molecule about the carbon-carbon bond is called ___________ |
| A. | Rotational energy |
| B. | Torsional energy |
| C. | Enantiomeric energy |
| D. | Potential energy |
| Answer» C. Enantiomeric energy | |
| 12. |
Conformations are different arrangements of atoms that can be converted into one another by rotation about ___________ |
| A. | Covalent bond |
| B. | Double bond |
| C. | Single bond |
| D. | Triple bond |
| Answer» D. Triple bond | |
| 13. |
GAUCHE_CONFORMATION_IS_LESS_STABLE_DUE_TO?$ |
| A. | Hydrogen bonding |
| B. | Covalent bonding |
| C. | Vander Waal’s repulsion |
| D. | Torsional strain |
| Answer» D. Torsional strain | |
| 14. |
BOTH_ANTI_AND_GAUCHE_CONFORMATIONS_ARE_FREE_OF_TORSIONAL_STRAIN.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
Potential energy remains same during the rotation about the carbon-carbon of n-butane.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
Which of the following is least stable?$ |
| A. | Anti conformation |
| B. | Gauche conformation |
| C. | Staggered conformation |
| D. | Eclipsed conformation |
| Answer» E. | |
| 17. |
In gauche conformations, the methyl groups ar? |
| A. | 60<sup>0</sup> apart |
| B. | 90<sup>0</sup> apart |
| C. | 180<sup>0</sup> apart |
| D. | 360<sup>0</sup> apart |
| Answer» B. 90<sup>0</sup> apart | |
| 18. |
The relative instability of any of the intermediate skew conformations is due to |
| A. | Lateral strain |
| B. | Shear strain |
| C. | Longitudinal strain |
| D. | Torsional strain |
| Answer» E. | |
| 19. |
The potential energy of n-butane is minimum for |
| A. | Skew conformations |
| B. | Staggered conformations |
| C. | Eclipsed conformations |
| D. | Gauche |
| Answer» C. Eclipsed conformations | |
| 20. |
The infinity of intermediate conformations are called |
| A. | Skew conformations |
| B. | Staggered conformations |
| C. | Eclipsed conformations |
| D. | Gauche |
| Answer» B. Staggered conformations | |
| 21. |
The rotation about the (C2 – C3) carbon-carbon bond of n-butane requires the energy of about$ |
| A. | 100 kJ/mol |
| B. | 50 kJ/mol |
| C. | 10 kJ/mol |
| D. | 3 kJ/mol |
| Answer» E. | |
| 22. |
The energy required to rotate n-butane molecule about the carbon-carbon bond is called |
| A. | Rotational energy |
| B. | Torsional energy |
| C. | Enantiomeric energy |
| D. | Potential energy |
| Answer» C. Enantiomeric energy | |
| 23. |
Conformations are different arrangements of atoms that can be converted into one another by rotation about |
| A. | Covalent bond |
| B. | Double bond |
| C. | Single bond |
| D. | Triple bond |
| Answer» D. Triple bond | |