Basicity of amines

36 questions on Basicity of amines from the Amines and Aromatic Nitrogen Compounds chapter: 8 NEET level, 14 JEE Main, 14 JEE Advanced. Each one opens with its answer and solution.

• Which of the following is the strongest base in aqueous solution? NEET level
• Aniline is a weaker base than ammonia mainly because: NEET level
• In the gas phase the correct order of basicity of methylamines is: NEET level
• Which statement about the basicity of toluidines and aniline is correct? NEET level
• Given that, in aqueous solution, the order of basicity of methylamines is (CH3)2NH > CH3NH2 > (CH3)3N > NH3, which pair correctly explains why trimethylamine is... JEE Main level
• Among the following, the weakest base is: JEE Main level
• The correct order of decreasing basicity is: JEE Main level
• Pyridine is a much stronger base than pyrrole because: JEE Main level
• Which of the following are weaker bases than ammonia in water? JEE Main level
• Which statements are correct? JEE Main level
• Guanidine, (H2N)2C=NH, is a very strong organic base because: JEE Main level
• At 298 K, K_b of ammonia is 1.74 x 10^-5 and the pK_a of the anilinium ion C6H5NH3+ is 4.60. Take pK_w = 14.00 and log_10 1.74 = 0.2406. Calculate pK_b(aniline)... JEE Advanced level
• Which statement correctly compares N,N-dimethylaniline (X) with N,N,2,6-tetramethylaniline (Y)? JEE Advanced level
• Given pK_b values at 298 K: NH3 4.75, CH3NH2 3.38, (CH3)2NH 3.27, (CH3)3N 4.22, C6H5NH2 9.38. Which statements are correct? (Use 10^1.37 = 23.4 and 10^4.63 = 4.... JEE Advanced level
• Which statements are correct for the following approximate pK_a values of conjugate acids: 2-nitroaniline -0.3, 3-nitroaniline 2.5, 4-nitroaniline 1.0, aniline ... JEE Advanced level
• Which of the following are weaker bases than aniline? JEE Advanced level
• A mixture of benzoic acid, aniline and nitrobenzene dissolved in ether is shaken first with aqueous NaHCO3 and then, after separation, with dilute HCl. The subs... JEE Advanced level
• Nitration of aniline with HNO3 and H2SO4 gives a considerable amount of 3-nitroaniline because: JEE Advanced level
• Which of the following is the strongest base in aqueous solution? NEET level
• Aniline is a weaker base than ammonia mainly because NEET level
• Which of the following is the most basic? NEET level
• In the gas phase the basic strength of methylamines follows the order NEET level
• Which is the correct order of basic strength in water of C6H5NH2, 4-methylaniline, 4-methoxyaniline and 4-nitroaniline? JEE Main level
• Among aniline, 2-methylaniline, 3-methylaniline and 4-methylaniline, the weakest base in water is JEE Main level
• The pKb of N,N-dimethylaniline is 8.85 and that of N,N,2-trimethylaniline is 8.14 (both in water). The higher basicity of the second compound is best explained ... JEE Main level
• Among 2-nitroaniline, 3-nitroaniline and 4-nitroaniline, the strongest base is JEE Main level
• The correct order of basic strength in water for guanidine, methylamine, pyridine and aniline is JEE Main level
• At 298 K the base dissociation constants in water are K_b(CH3NH2) = 4.4 x 10^-4 and K_b(C6H5NH2) = 4.2 x 10^-10. Calculate pK_b(C6H5NH2) - pK_b(CH3NH2). Give th... JEE Main level
• Which of the following statements about the basicity of amines are correct? (Use the standard aqueous orders for methyl and ethyl amines.) JEE Main level
• Which of the following statements are correct? JEE Advanced level
• Given pKb values at 298 K: CH3NH2 3.38, (CH3)2NH 3.27, (CH3)3N 4.22, NH3 4.75, C6H5NH2 9.38. Which conclusions are correct? JEE Advanced level
• 1.0 mole of 4-(aminomethyl)aniline, H2N-C6H4-CH2NH2 (the two groups are para to each other), is treated with exactly 1.0 mole of dilute HCl. The main site of pr... JEE Advanced level
• Which is the correct decreasing order of basic strength in water of (I) (C2H5)2NH, (II) (C2H5)3N, (III) C2H5NH2, (IV) C6H5NH2 and (V) CH3CONH2? JEE Advanced level
• For CH3NH2, K_b = 4.4 x 10^-4 at 298 K. Solving the quadratic exactly (no approximation for the degree of ionisation), the pH of a 0.0010 M aqueous solution is ... JEE Advanced level
• The pKb of aniline is 9.40 at 298 K (pK_w = 14.00). Ignoring the ionisation of water and any approximation errors, the pH of a 0.10 M solution of anilinium chlo... JEE Advanced level
• Assertion: 3-Nitroaniline is a stronger base than 4-nitroaniline. Reason: In 4-nitroaniline the nitrogen lone pair is delocalised onto the nitro group through t... JEE Advanced level