Organic Reaction Concepts include: Displacement and nucleophilic substitution reactions, organic compound mechanism, elimination reactions, redox reactions,  photochemistry, nucleophiles, electrophiles, bond cleavage, reaction intermediates and kinetics. Here are some concepts related to organic reactions: Elimination reactions: Involves the elimination of two substituents from a molecule in one or two steps. Most elimination reactions result in the loss of at least one hydrogen atom and form double bonds. Substitution reactions: Involves the substitution of one atom for another. Addition... Show more

Organic Reaction Concepts include: Displacement and nucleophilic substitution reactions, organic compound mechanism, elimination reactions, redox reactions,  photochemistry, nucleophiles, electrophiles, bond cleavage, reaction intermediates and kinetics.

Here are some concepts related to organic reactions:
Elimination reactions: Involves the elimination of two substituents from a molecule in one or two steps. Most elimination reactions result in the loss of at least one hydrogen atom and form double bonds.
Substitution reactions: Involves the substitution of one atom for another.
Addition reactions: Involves the addition of an atom to a compound with double or triple bonds.
Isomerism: An important topic in organic chemistry. In most organic reactions, the products are formed based on the concept of isomerism.
Resonance: An essential aspect of organic chemistry. If the electron pattern of a molecule cannot be described with the help of one Lewis structure, it is called a resonance hybrid.
Aryl radicals: Versatile synthetic intermediates in organic chemistry. They also play roles in biology, such as in the DNA cleavage process. 

Organic reactions are generally slower than inorganic reactions because organic compounds contain covalent bonds. Covalent bonds are typically harder to break. Most organic reactions are carried out in multiple steps. 

Show less

Organic Chemistry Practice Test: Organic Reaction Concepts

Time left 00:00

25 Questions

1. Compound undergoing homolytic bond cleavage will lead to formation of which chemical species?

AtomsAnionFree radicalCation

2. Which of the following is most readily undergo electrophilic attack?

IVIIIIII

3. Which of the following statements is correct for alkyl halide?

In unimolecular reaction, increasing the temperature donot favours E1 mechanismAs branching at carbon increases, E1 mechanism is favoured as compared to SN1 mechanismAlkyl halide will always show SN1 mechanismIn most unimolecular reactions of alkyl halide E1 reaction is favoured over SN1 reaction

4. Which of the following statement (s) is/are true about the following eliminations?

(1) Hoffmann product is major product in I (2) Saytzeff product is major product in I (3) Hoffmann product is major product in II (4) Saytzeffproduct is major product in II

1 and 22 and 33 and 41 and 4

5. Which one is an excellent substrate for SN₂ reaction?

CH3 – CH2 – Cl

6. Which is the suitable catalyst for bringing out the transformation given below?

dibenzoyl peroxideNaOEttungsten lampBF3. Et20

7. Which of the following reaction has a faster rate of reaction for nascent oxygen atom?

R1 < R2R1 >> R2R1 > R2R1 << R2

8. Which of the following are the reactions in which molecules absorbing light do not themselves react but induce other molecules to react?

Reversible reactionsPhotosensitized reactionsFree radical reactionsChain reactions

9. Which of the following is not the examples of E₁CB reaction?

10. What is the correct decreasing order of stability of following cation?

I > IV > II > IIIIV > III > II > II > II > III > IVI > III > II > IV

11. Which of the following statement is true about the reaction given below?

It involves a carbocation intermediateIt proceeds via a concerted SN2 pathwayThe rearrangement is due to SN1 reaction mechanismIt proceeds via a concerted SN1 pathway

12. Which of the reagent will give effective transformation of given compounds?

CH3LiPh3P = CH2CH2N2(CH3)2CuLi

13. Identify correct step representing S_N1 mechanism for the cleavage of ether with HI.

1 and 32 and 41 and 42 and 3

14. Which of the following is not an electrophile?

Br2H2OHBrCl2

15. Which of the following nucleophile can be used for partial enolization 1,3-Dicarbonyl compound?

Et-O–Lithium di-isopropyl amide (LDA)Sodium acetateWeak base like NaOH

16. Which of the following cannot react as a nucleophile?

(CH3)3NCH3NH2(CH3)4N+(CH3)2NH

17. Which of the following order is incorrect for the rate of E2 reaction?

5-Bromocycloheptene > 4-Bromocycloheptene3-Bromocyclohexene > Bromocyclohexane3-Bromo-2-methylpentane > 2-Bromo-4-methylpentane2-Bromo- I -phenylbutane > 3-Bromo- I-phenylbutane

18. Which of the following reaction is not possible?

19. When the all-cis isomer of C₆H₆Cl₆ (2, 3, 4, 5, 6-Hexachlorocyclohexane) is heated with alc.KOH, what will be the most probable product?

20. In which form energy is stored in chemical bonds?

Chemical energyKinetic energyThermal energyPotential energy

21. What will be the correct order of S_N2/E2 ratio for the %yield of the product of the following halide?

II > I > III > IVI > III > IV > IIIII > II > IV > IIII > IV > II > I

22. In addition of halogen (Bromine) to an alkene, how can we isolate a bromonium in the reaction?

decreasing concentration of bromide ionincreasing concentration of bromide ionalkene with less electrophilic centrealkene with cation stabilising groups

23. Which of the following is not true about combustion of hydrocarbons?

With alkenes and alkynes, the electron-deficient hydroxyl radical adds to the multiple bondAll hydrocarbons react in air to form carbon monoxide and then carbon dioxideAlkanes, the hydroxyl radical abstracts a hydrogen atom and forms a carbanionFirst step is always the reaction between the hydrocarbon and hydroxyl radical

24. What is the type of reaction between alkanes and hydroxyl radical?

exothermicendothermicisothermalisochoric

25. Which halide ion is the best nucleophile in dimethyl sulfoxide solution?

Br–F–I–Cl–