MCQOPTIONS
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MCQOPTIONS
This section includes 155 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The general formula for the alkynes is |
| A. | CNH2N+2 |
| B. | CNH2N |
| C. | CNH2N-2 |
| D. | CNH2N+1 |
| Answer» D. CNH2N+1 | |
| 2. |
The general formula for the alkanes is |
| A. | CNH2N |
| B. | CNH2N+1 |
| C. | CNH2N-2 |
| D. | CNH2N+2 |
| Answer» E. | |
| 3. |
How can you determine if a reaction is endothermic? |
| A. | The temperature of the system decreases. |
| B. | The temperature of the system increases. |
| C. | The temperature of the system remains constant. |
| D. | The temperature of the system fluctuates |
| Answer» B. The temperature of the system increases. | |
| 4. |
One of the raw materials used in preparing ethyne (C2H2) contains a number of impurities. Two of these impurities are |
| A. | calcium carbonate and calcium phosphide |
| B. | copper sulfate and calcium phosphide |
| C. | calcium sulfide and calcium phosphide |
| D. | calcium sulfide and hydrochloric acid |
| Answer» D. calcium sulfide and hydrochloric acid | |
| 5. |
What is the main component of natural gas? |
| A. | Methane |
| B. | Ethane |
| C. | Ethene |
| D. | Propane |
| Answer» B. Ethane | |
| 6. |
In a laboratory experiment, students tested the solubility of different solutes in methylbenzene. They made a table as shown. However, two of these results are incorrect. Select the two incorrect results from the list below |
| A. | Cooking oil and water |
| B. | Cyclohexane and iodine |
| C. | Salt water and octane |
| D. | Salt water and cyclohexane |
| Answer» D. Salt water and cyclohexane | |
| 7. |
Ethyl halides are reduced by_________ hydrogen. |
| A. | ordinaiy |
| B. | none of above |
| C. | nascent |
| D. | nil |
| Answer» B. none of above | |
| 8. |
Ethane is _________ in water. |
| A. | soluble |
| B. | insoluble |
| C. | solvent |
| D. | none of above |
| Answer» C. solvent | |
| 9. |
Iodine gives _______product with acetylene. |
| A. | tetra-iodo |
| B. | dia-aiodo |
| C. | none of above |
| D. | di-iodo |
| Answer» E. | |
| 10. |
The number of electron in M-shell of an element having atomic number 24 is |
| A. | 11 |
| B. | 12 |
| C. | 13 |
| D. | 10 |
| Answer» D. 10 | |
| 11. |
Methane is oxidized to _________ at 400c° and 200 atm. in presence of Cu |
| A. | none of above |
| B. | nil |
| C. | methanal |
| D. | methanol |
| Answer» E. | |
| 12. |
Alkanes ______________ chemically with electrophiles and nucleophiles. |
| A. | do not react |
| B. | react |
| C. | nil |
| D. | none of above |
| Answer» B. react | |
| 13. |
The reaction of alkanes with chlorine is _________ than with bromine. |
| A. | none of above |
| B. | lower |
| C. | faster |
| D. | between |
| Answer» D. between | |
| 14. |
A source of light is passed through isolated chlorophyll solution.When source is removed, which light is emitted by solution? |
| A. | Red- Orange |
| B. | Green |
| C. | No light is emitted |
| D. | Same as source of light |
| Answer» C. No light is emitted | |
| 15. |
On heating a liquid at its dynamic equilibrium the concentration of molecules in vapour state as well as in liquid state |
| A. | Remains constant |
| B. | Neither increase nor decreases |
| C. | Increase |
| D. | Decreases |
| Answer» B. Neither increase nor decreases | |
| 16. |
Acetylenic __________ hydrogen atoms are in nature. |
| A. | acidic |
| B. | solvent |
| C. | basic |
| D. | none of above |
| Answer» B. solvent | |
| 17. |
The acylation of benzene is called__________ reaction. |
| A. | wurtz |
| B. | ke Wa |
| C. | none of above |
| D. | Friedel and craft |
| Answer» E. | |
| 18. |
The _________ directing groups |
| A. | none of above |
| B. | para |
| C. | meta |
| D. | ortho |
| Answer» C. meta | |
| 19. |
Benzene was discovered by |
| A. | We ke |
| B. | none of above |
| C. | Faraday |
| D. | ke We |
| Answer» D. ke We | |
| 20. |
________is used as a synthetic fibre. |
| A. | nil |
| B. | vinyl acetate |
| C. | acrylonitrile |
| D. | none of above |
| Answer» D. none of above | |
| 21. |
Benzene _________ oxidized by kMnO4 or K2Cr2O7 |
| A. | is |
| B. | are not |
| C. | none of above |
| D. | is not |
| Answer» E. | |
| 22. |
Alkenes__________the colour of basic solution of KMnO |
| A. | charge |
| B. | discharge |
| C. | none of above |
| D. | nil |
| Answer» E. | |
| 23. |
Ethylene is a ________ molecule. |
| A. | nil |
| B. | polar |
| C. | none of above |
| D. | nonpolar |
| Answer» E. | |
| 24. |
__________group acts as a negative group in Ho x molecules. |
| A. | none of above |
| B. | halogen |
| C. | nil |
| D. | hydroxyl |
| Answer» E. | |
| 25. |
Alkanes are __________ in water. |
| A. | none of above |
| B. | soluble |
| C. | insoluble |
| D. | solvent |
| Answer» D. solvent | |
| 26. |
Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide? |
| A. | Isohexane |
| B. | Neopentane |
| C. | Neohexane |
| D. | Tertiary butyl chloride |
| Answer» C. Neohexane | |
| 27. |
Benzene is ____________ in alcohol (or in soluble). |
| A. | insoluble |
| B. | soluble |
| C. | none of above |
| D. | solute |
| Answer» B. soluble | |
| 28. |
Ozonolysis of an organic compound 'A' produces acetone and propionaldehyde in equimolar mixture. Identify 'A' from the following compounds |
| A. | 2 - Methyl - 2 - pentene |
| B. | 2 - Methyl - 1 - pentene |
| C. | 1 - Pentene |
| D. | 2 - Pentene |
| Answer» B. 2 - Methyl - 1 - pentene | |
| 29. |
The angle strain in cyclobutane is |
| A. | 24°44? |
| B. | 29°16? |
| C. | 19°22? |
| D. | 9°44? |
| Answer» E. | |
| 30. |
A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______. |
| A. | 2, 2-dibromobutane |
| B. | 1, 4-dibromobutane |
| C. | 1, 1-dibromopropane |
| D. | 1, 2-dibromoethane |
| Answer» C. 1, 1-dibromopropane | |
| 31. |
Ethyl benzene CANNOT be prepared by ______. |
| A. | Wurtz-Fittig reaction |
| B. | Clemmensen reduction |
| C. | Wurtz reaction |
| D. | Friedel-Crafts reaction |
| Answer» D. Friedel-Crafts reaction | |
| 32. |
The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are |
| A. | BrCH2CH2CH2CH3 and CH2CH2C ? CH |
| B. | BrCH2CH 2CH2CH2CH3 and CH3CH2C ? CH |
| C. | BrCH2CH2CH2CH2CH3 and CH2C ? CH |
| D. | BrCH2CH2CH3 and CH3CH2CH2C ? CH |
| Answer» B. BrCH2CH 2CH2CH2CH3 and CH3CH2C ? CH | |
| 33. |
Which one of these is NOT TRUE for benzene? |
| A. | There are three carbon-carbon single bonds and three carbon-carbon double bonds |
| B. | Heat of hydrogenation of benzene is less than the theoretical value |
| C. | The bond angle between carbon-carbon bonds is 120° |
| D. | It forms only one type of monosubstituted product |
| Answer» B. Heat of hydrogenation of benzene is less than the theoretical value | |
| 34. |
Among the following compounds the one that is most reactive towards electrophilic nitration is |
| A. | Toluene |
| B. | Benzene |
| C. | Benzoic Acid |
| D. | Nitrobenzene |
| Answer» B. Benzene | |
| 35. |
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is |
| A. | Propene |
| B. | 1-butene |
| C. | Ethane |
| D. | 2-butene |
| Answer» C. Ethane | |
| 36. |
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of |
| A. | Two ethylenic double bonds |
| B. | A vinyl group |
| C. | An acetylenic triple bond |
| D. | An isopropyl group |
| Answer» C. An acetylenic triple bond | |
| 37. |
__________ carbide reacts with water to give methane |
| A. | Calcium |
| B. | Aluminium |
| C. | none of above |
| D. | 1 and 2 |
| Answer» C. none of above | |
| 38. |
Ethene is slightly_________ in taste. |
| A. | sweet |
| B. | none of above |
| C. | bitter |
| D. | tasteless |
| Answer» B. none of above | |
| 39. |
Methane is the ______ component of natural gas: |
| A. | between |
| B. | major |
| C. | minor |
| D. | none of'above |
| Answer» C. minor | |
| 40. |
The carbon, carbon bond lengths in benzene are A° |
| A. | 1.54 |
| B. | 1.397 |
| C. | 1.34 |
| D. | none of above |
| Answer» C. 1.34 | |
| 41. |
The hydrocarbons which contain at least_________benzene ring in their molecules are, called aromatic hydrocarbon. |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | none of above |
| Answer» D. none of above | |
| 42. |
Calcium carbide reacts with water to produce |
| A. | none of above |
| B. | nil |
| C. | acetylene |
| D. | ethane |
| Answer» D. ethane | |
| 43. |
The old name of alkenes was |
| A. | nil |
| B. | olefin |
| C. | paraffins |
| D. | none of above |
| Answer» C. paraffins | |
| 44. |
The hydrocarbon in which all the four valencies of carbon atoms are fully utilized are called________ |
| A. | alkanes |
| B. | alkynes |
| C. | alkenes |
| D. | none of above |
| Answer» B. alkynes | |
| 45. |
Chlorination of alkanes is an example of________ reaction. |
| A. | none of above |
| B. | elimination |
| C. | redical |
| D. | free redical |
| Answer» E. | |
| 46. |
Removal of __ from a molecule is called dehydration. |
| A. | none of above |
| B. | Acid |
| C. | base |
| D. | Water |
| Answer» E. | |
| 47. |
Which one of these is not a source of methane gas? |
| A. | Burning coal |
| B. | Refuse dumps |
| C. | Anaerobic decomposition of animal waste |
| D. | Ruminating animals such as cattle, sheep and pigs |
| Answer» B. Refuse dumps | |
| 48. |
The formula that shows how atoms are arranged in a molecule is called the |
| A. | actual formula |
| B. | structural formula |
| C. | empirical formula |
| D. | molecular formula |
| Answer» C. empirical formula | |
| 49. |
n-Proply bromide on treatment with ethanolic KOH is |
| A. | Propane |
| B. | Propene |
| C. | Propyne |
| D. | Propanal |
| Answer» C. Propyne | |
| 50. |
Acetylene is prepared by the action of water on |
| A. | Al4C3 |
| B. | Silicon carbide |
| C. | CaC2 |
| D. | All of these |
| Answer» D. All of these | |