Organic Chemistry Objective Questions and Answers | Organic Chemistry MCQs and Answers

Questions

1 When a bond is dissociated, what is the change in energy in surrounding?

A Energy is absorbed

B Energy is released

C No change in energy

D Firstly, energy will be absorbed and then released

View Answer

Answer: Energy is absorbed

2 Energy released or absorbed in a chemical bond formation or dissociation is measured in which of the following units?

A Kelvin

B Joule

C Pascal

D mol

View Answer

Answer: Joule

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3 What will be the change in energy for the following reaction?

H₂(g)+F₂(g)→ 2HF

Given: To break one mole of H2, energy absorbed is 436 kJ. To break one mole of F2, energy absorbed is 158 kJ. To form one moles of HF, energy released is 568 kJ.

A 542KJ

B -542KJ

C 26 KJ

D -26 KJ

View Answer

Answer: -542KJ

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

A Anion

B Cation

C Free radical

D Atoms

View Answer

Answer: Free radical

5 In which form energy is stored in chemical bonds?

A Kinetic energy

B Chemical energy

C Potential energy

D Thermal energy

View Answer

Answer: Potential energy

6 Which one of the following statements best describes the enthalpy change of a reaction?

A The energy released when chemical bonds are formed during a chemical reaction

B The energy consumed when chemical bonds are broken during a chemical reaction

C The difference between the energy released by bond formation and the energy consumed by bond cleavage during a chemical reaction

D The increase in disorder of the system as a reaction proceeds

View Answer

Answer:The difference between the energy released by bond formation and the energy consumed by bond cleavage during a chemical reaction

7 Which of the following terms describes a reaction in where more energy is released by bond formation than is consumed by bond cleavage?

A Exothermic

B Endothermic

C Isothermal

D Adiabatic

View Answer

Answer: Exothermic

8 Which energy is required for homolytic cleavage?

A Singlet

B Doublet

C Triplet

D Quadruplet

View Answer

Answer: Triplet

9 Which energy is required for heterolytic cleavage?

A Singlet

B Doublet

C Triplet

D Quadruplet

View Answer

Answer: Singlet

10 How the bond dissociation enthalpy changes as one goes along the series of diatomics Li₂, B₂, C₂, N₂, O₂ and F₂?

A Increases

B Decreases

C Increases then decreases

D Decreases then increases

View Answer

Answer:Increases then decreases

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