Organic Chemistry Practice Test 4

1. What will be the product for the following reaction?

2. Which is not true for a second order reduction?

It can have rate constant 1 x 10^-2 L mol^-1 s^-1

Time to complete 75% reaction is twice of half-life

T₅₀ = 1/(k_a⋅A₀)

Its half-life is inversely proportional to its initial concentration

3. Which reagent is a good nucleophile?

HBr

Br₂

NH₃

BH₃

4. Which ring will readily undergo electrophilic attack?

III

Both I and III

5. Arrange the following intermediate into decreasing order of stability.

II > III > IV > I

III > IV > II > I

I > III > II > IV

I > III > IV > II

6. Which of the following is not an electrophile?

H₂O

Br₂

Cl₂

HBr

7. What is the electrophile in the acylation of benzene?

Cl⁺

CO⁺

R-CO⁺

AlCl₃

8. What is the correct order for the rate of reaction for the electrophilic attack of the given compounds?

III > I > II

I > II > III

I < II < III

II > I > III

9. Which energy is required for heterolytic cleavage?

Quadruplet

Triplet

Singlet

Doublet

10. Which is the correct combination of reagent which can carry out following conversion?

(i) NaBH₄ ∙ CeCl₃ then H⁺ (ii) MnO₂ (iii) CH₃ – Li

(i) CH₃ - Li, then H⁺ (ii) PCC / ∆

(i) (CH₃)₂ CuLi then H⁺ (ii) NaBH₄ EtOH (iii) H₂S0₄ / ∆

(i) CH₃ - MgBr then H⁺ (ii) H₂S0₄ / ∆ (iii) NH₂ - NH₂ / KOH