MCQOPTIONS
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MCQOPTIONS
This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one of the following methods will not give benzene? |
| A. | Heating sod. Salt of Benzoic acid with soda lime |
| B. | Distilling phenol with Zn dust |
| C. | Chlorobenzene with NaOH at 360?C & 150atm. |
| D. | Hydrolysis of benzene sulphonic acid with super heated steam. |
| Answer» D. Hydrolysis of benzene sulphonic acid with super heated steam. | |
| 2. |
Reacting bromine with benzene in the presence of sunlight will result in |
| A. | The rupturing of benzene ring |
| B. | Substitution reaction |
| C. | Addition reaction |
| D. | No-reaction |
| Answer» D. No-reaction | |
| 3. |
In benzene sulphonic acid the sulphonic group is attached with benzene ring through |
| A. | Hydrogen |
| B. | Oxygen |
| C. | Sulphur |
| D. | ?OH |
| Answer» D. ?OH | |
| 4. |
The molecular formula of toluene is |
| A. | C7H7 |
| B. | C7H8 |
| C. | C8H8 |
| D. | C8H7 |
| Answer» C. C8H8 | |
| 5. |
Phenanthrene is a fused polycyclic compound contains ______ benzene rings |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Five |
| Answer» C. Four | |
| 6. |
Aniline is a derivative of benzene which contains |
| A. | Imino group |
| B. | Amino group |
| C. | Amide group |
| D. | Nitro group |
| Answer» C. Amide group | |
| 7. |
What catalyst is employed when benzene is prepared from acetylene at 70?C? |
| A. | Cr2O3 + A?2O3 + SiO2 |
| B. | Raney nickel |
| C. | Organo-nickel |
| D. | Ni 250 - 300?C |
| Answer» D. Ni 250 - 300?C | |
| 8. |
How many ? electrons are there in benzene to form delocalized electronic cloud |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 9. |
The resonance energy of benzene is |
| A. | 150.5 kJ/mol |
| B. | 250.5 kJ/mol |
| C. | 150.5 Cal/mol |
| D. | 250.5 Cal/mol |
| Answer» B. 250.5 kJ/mol | |
| 10. |
When two or more different substituents are attached with a benzene ring the number 1 position in the ring is given to a high priority group. Which one of the following groups has highest priority? |
| A. | ?NH2 |
| B. | ?CHO |
| C. | ?COOH |
| D. | ?CN |
| Answer» D. ?CN | |
| 11. |
Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from |
| A. | Acetylene |
| B. | N-hexane |
| C. | Benzene sulphonic acid |
| D. | Sodium benzoate |
| Answer» C. Benzene sulphonic acid | |
| 12. |
In Friedel Craft Alkylation A?C?3 is used to generate |
| A. | Strong nucleophile |
| B. | Weak nucleophile |
| C. | Strong electrophile |
| D. | Weak electrophile |
| Answer» D. Weak electrophile | |
| 13. |
Which is fused cyclic aromatic compound |
| A. | Diphenyl amine |
| B. | Diphenyl methane |
| C. | Naphthalene |
| D. | Biphenyl |
| Answer» D. Biphenyl | |
| 14. |
Acetophenone is a |
| A. | Ether |
| B. | Ketone |
| C. | Aldehyde |
| D. | Ester |
| Answer» C. Aldehyde | |
| 15. |
Benzene is heated in air with V2O5 at 450?C it undergoes |
| A. | Substitution reaction |
| B. | Addition reaction |
| C. | Elimination reaction |
| D. | Oxidation reaction |
| Answer» E. | |
| 16. |
Benzene does not undergo |
| A. | Substitution reaction |
| B. | Addition reaction |
| C. | Polymerization reactions |
| D. | Oxidation reactions |
| Answer» D. Oxidation reactions | |
| 17. |
During sulphonation of benzene H2SO4 generates the electrophile |
| A. | HSO4- |
| B. | SO2 |
| C. | SO3 |
| D. | H+ |
| Answer» D. H+ | |
| 18. |
Nitronium ion is |
| A. | NO3 |
| B. | NO |
| C. | NO2- |
| D. | NO2+ |
| Answer» E. | |
| 19. |
Which one of the following statement is not correct about benzene? |
| A. | On hydrogenation 208 KJ/mole is liberated |
| B. | C-H bond length in benzene is 1.09 A? |
| C. | Molecular mass of benzene is 78.108 |
| D. | Resonance energy of benzene is 150.5 K Cal/mole |
| Answer» E. | |
| 20. |
Which compound will readily undergo sulphonation? |
| A. | Benzene |
| B. | Nitro benzene |
| C. | Toluene |
| D. | Chlorobenzene |
| Answer» D. Chlorobenzene | |
| 21. |
The preparation of benzene from acetylene can also be said as |
| A. | Oxidation |
| B. | Polymerization |
| C. | Dehydration |
| D. | Condensation |
| Answer» C. Dehydration | |
| 22. |
What is required other than anhydrous A?C?3 when toluene is prepared by Friedal craft reaction? |
| A. | C6H6 |
| B. | C6H6 + CH3C? |
| C. | C6H5C2H5 |
| D. | C6H5C? & CH3Cl |
| Answer» C. C6H5C2H5 | |
| 23. |
Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as |
| A. | Dows process |
| B. | Friedel & Craft acylation |
| C. | Friedel & Craft alkylation |
| D. | Clemmenson reduction |
| Answer» D. Clemmenson reduction | |
| 24. |
Which one of the following radical is called benzyl radical? |
| A. | C6H5? |
| B. | C6H5?C |
| C. | C6H5?CH- |
| D. | C6H5?CH2- |
| Answer» E. | |
| 25. |
Which compound form benzoic acid on oxidation with acidified KMnO4 or K2Cr2O7 |
| A. | Toluene |
| B. | Ethyl benzene |
| C. | N-propyl benzene |
| D. | All |
| Answer» E. | |
| 26. |
Ozonolysis of benzene produces |
| A. | Glycol |
| B. | Glyoxal |
| C. | Vicinal diol |
| D. | Both b & c |
| Answer» C. Vicinal diol | |
| 27. |
Which one of the following is benzal chloride? |
| A. | C6H5 CH2C? |
| B. | C6H5 CHC?2 |
| C. | C6H5 -CH = CHC? |
| D. | None of the above |
| Answer» C. C6H5 -CH = CHC? | |
| 28. |
What is the molecular formula of Benzenetriozonide? |
| A. | C6H6O9 |
| B. | C6H5O8 |
| C. | C6H5O9 |
| D. | C6H6O6 |
| Answer» B. C6H5O8 | |
| 29. |
The hydrolysis of Benzenetrizonide will yield three moles of |
| A. | Glyoxime |
| B. | Benzaldehyde |
| C. | Glycol |
| D. | Glyoxal |
| Answer» E. | |
| 30. |
When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound? |
| A. | Bromine |
| B. | Chlorine |
| C. | Fluorine |
| D. | Iodine |
| Answer» E. | |
| 31. |
Which one of the following is not a meta directing group? |
| A. | ?CN |
| B. | ?OH |
| C. | ?COOH |
| D. | ?CHO |
| Answer» C. ?COOH | |
| 32. |
Which pair of groups contains both ortho & para directing groups |
| A. | ?OH ?RCO |
| B. | ?NR3 ?CN |
| C. | ?OCH3 ?CHO |
| D. | ?N (CH3)2 -NH2 |
| Answer» E. | |
| 33. |
Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in |
| A. | The presence of Oxygen |
| B. | The presence of Hydrogen |
| C. | The absence of Oxygen |
| D. | The presence of excessive Oxygen |
| Answer» D. The presence of excessive Oxygen | |
| 34. |
By which method the molecular mass of benzene was determined as 78.108? |
| A. | Specific gravity method |
| B. | Vapour density method |
| C. | X-ray diffraction method |
| D. | Distillation methos |
| Answer» C. X-ray diffraction method | |
| 35. |
How many moles of H2 are added up when benzene is heated with hydrogen in the presence of platinum? |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Six |
| Answer» C. Four | |
| 36. |
Chlorination of toluene in the presence of sublight produces |
| A. | Benzyl chloride |
| B. | O - chlorotoluene |
| C. | P - chlorotoluene |
| D. | Benzoic acid |
| Answer» B. O - chlorotoluene | |
| 37. |
The heat of hydrogenation of cyclohexene is |
| A. | ?239 kJ mol-1 |
| B. | ?208 kJ mol-1 |
| C. | ?119.5 kJ/mol |
| D. | ?119.5 kcal/mol |
| Answer» D. ?119.5 kcal/mol | |
| 38. |
Nitration of chlorobenzene gives |
| A. | O - chloronitrobenzene |
| B. | P - chloronitrobenzene |
| C. | M - chloronitrobenzene |
| D. | A & b |
| Answer» E. | |