Reaction Mechanism MCQs [Organic Chemistry]

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

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1. : Amongst the following which will show anti-Markownikoff addition in the absence of peroxides?



2. : According to transition state theory which is not the compulsory requirement for reaction to occur?



3. : With reference to collision theory, reaction takes place when molecules are ________.



4. : Which is an example of sigmatropic rearrangement?



5. : Formation of polyamide ‘Nylon’ from adipic acid and hexamethylene diamine is an example of



6. : Homolytic fission of covalent bond results in the formation of ____ .



7. : Kinetics of SN2 reactions are normally _____.



8. : Which is true about carbanions?



9. : The order of stability of free radicals



10. : Which of the carbocation is likely stable?



11. : A reaction intermediate having only six electrons in the outer orbit of carbon but charge on it, is called ________.



12. : Which is an electrophile?



13. : Which is the reaction in which bond breaking and making processes take place simultaneously?



14. : Free radicals are characterized by which of the following?



15. : Heterolysis of which bond is likely to form carbanion?



16. : Entropy is a measure of



17. : Dehydration of alcohol in acidic conditions is an example of _________ reaction



18. : What is the type of reaction exhibited by alkanes?



19. : Which reactions are not shown by benzaldehyde?



20. : SN2 reactions are



21. : Cannizzaro reaction involves migration of which species?



22. : The reactions of benzene ring are mainly



23. : Which is the reactions of carbonyl group?



24. : The change in the state of hybridization of carbon in the reaction R-CN → RCONH₂ is



25. : Diels-Alder reaction is an example of which type of reaction?



26. : In the thermal conversion of cyclobutene to butadiene, the reaction is symmetry allowed if there is



27. : Which bond is likely to break by homolysis?



28. : Heterolysis of a ‘C-C’ covalent bond forms?



29. : The SN2 mechanism occurs in _______.



30. : Which statements about the SN1 mechanism is false?



31. : Which is the most reactive compound by the SN2 mechanism?



32. : Which is the most reactive compound by the SN1 mechanism?



33. : Which statements is false?



34. : Which is most reactive as a nucleophile?



35. : Which statements about the E1 mechanism is false?



36. : In most of the cases,_________ compete with SN2 reactions.



37. : Which statements about the E2 mechanism is false?



38. : Which statements about mechanisms of elimination reaction is false?



39. : Bromobenzene can’t undergo reaction due to which of the following?



40. : In elimination reactions bulky leaving groups prefers to give



41. : In Saytzeff product a base nucleophile attacks the substrate



42. : In elimination reactions, poor leaving group favors to follow which mechanism?



43. : Which type of solvent needed for the reactions to perform SN2 mechanism.



44. : Mechanism of reaction may be studied with the help of



45. : In the dehydrohalogenation of 2-chlorobutane, what is the main product?



46. : Carbene intermediate is involved in which reaction



 

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