Quiz- Basic Strength of Amines

Basic Strength of Amines Quiz

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Test your knowledge on the basic strength of amines for JEE and NEET.

1. What is the correct order of basicity of the following amines in an aqueous solution?

• Secondary > Primary > Tertiary
• Primary > Secondary > Tertiary
• Tertiary > Secondary > Primary
• Secondary > Tertiary > Primary

2. What is the correct order of basicity of the following amines in the gaseous phase?

• Primary > Secondary > Tertiary
• Secondary > Primary > Tertiary
• Tertiary > Secondary > Primary
• Primary = Secondary = Tertiary

3. The basicity of an amine is due to the availability of the lone pair of electrons on the nitrogen atom. What effect do electron-donating groups have on this?

• Increase basicity
• Decrease basicity
• No effect on basicity
• Only affect the reaction rate

4. Why is aniline less basic than methylamine?

• The lone pair on the nitrogen in aniline is delocalized over the benzene ring.
• The phenyl group is an electron-donating group.
• Aniline is a primary amine, while methylamine is a secondary amine.
• Aniline is sterically hindered.

5. In aqueous solution, the basicity of amines is influenced by which of the following factors?

• Inductive effect only
• Steric hindrance only
• Solvation effect only
• Inductive effect, steric hindrance, and solvation effect

6. Which of the following is the most basic?

• Ammonia ($NH_3$)
• Methylamine ($CH_3NH_2$)
• Dimethylamine ($(CH_3)_2NH$)
• Trimethylamine ($(CH_3)_3N$)

7. In an aqueous solution, the order of basicity of methylamines is different from ethylamines. Why?

• Steric hindrance is greater in methylamines.
• The inductive effect of the ethyl group is weaker than that of the methyl group.
• Solvation effect dominates more in methylamines.
• The ethyl group is a stronger electron-donating group, leading to more steric hindrance and reduced solvation.

8. Which of the following is the weakest base?

• Aniline ($C_6H_5NH_2$)
• Ammonia ($NH_3$)
• Benzylamine ($C_6H_5CH_2NH_2$)
• p-toluidine

9. The basic strength of an amine is related to its $pK_b$ value. A stronger base has:

• A high $pK_b$ value.
• A low $pK_b$ value.
• A high $pK_a$ value.
• Both a low $pK_b$ and a high $pK_a$ value.

10. What is the effect of an electron-withdrawing group (EWG) like a nitro group on the basicity of an aromatic amine?

• It increases basicity.
• It decreases basicity.
• It has no effect.
• It only affects solubility.

11. Which of the following is the correct order of basicity for ethylamines in aqueous solution?

• Primary > Secondary > Tertiary
• Secondary > Tertiary > Primary
• Tertiary > Secondary > Primary
• Primary = Secondary = Tertiary

12. What is the role of the solvent in determining the basicity of amines in an aqueous solution?

• It stabilizes the amine itself.
• It has no role.
• It stabilizes the conjugate acid (ammonium ion) through hydrogen bonding.
• It increases steric hindrance.

13. Which of the following is the most basic among the given options?

• Pyridine
• Pyrrole
• Aniline
• Ammonia

14. What is the correct order of basicity of the following amines: methylamine, ammonia, and aniline?

• Aniline > Ammonia > Methylamine
• Methylamine > Aniline > Ammonia
• Methylamine > Ammonia > Aniline
• Ammonia > Methylamine > Aniline

15. The basic strength of an amine is defined by its ability to:

• Accept a proton
• Donate a proton
• Accept an electron pair
• Donate an electron pair

16. Which of the following factors has the least influence on the basicity of an amine in the gas phase?

• Inductive effect
• Resonance
• Solvation
• Steric hindrance

17. Which of the following is the most basic among a primary, secondary, and tertiary amine in a non-polar solvent?

• Primary amine
• Secondary amine
• Tertiary amine
• All are equally basic

18. The basicity of substituted anilines is primarily governed by:

• Steric hindrance
• Inductive effect and resonance
• Hydrogen bonding
• Solvation effect

19. Which of the following compounds is the strongest base?

• Triethylamine ($(C_2H_5)_3N$)
• Dimethylamine ($(CH_3)_2NH$)
• Ethylamine ($C_2H_5NH_2$)
• Trimethylamine ($(CH_3)_3N$)

20. Why is the basicity of a secondary amine in aqueous solution greater than that of a primary amine?

• The secondary amine has more alkyl groups.
• The primary amine is more sterically hindered.
• The secondary amine's conjugate acid is more effectively stabilized by a combination of inductive effect and solvation.
• Primary amines are more soluble in water.

Quiz Results