Exams › JEE Main › Chemistry

The correct order in aqueous medium of basic strength in case of methyl substituted amines is:

1. (1) Me2NH > MeNH2 > Me3N > NH3
2. (2) Me3N > Me2NH > MeNH2 > NH3
3. (3) NH3 > Me3N > MeNH2 > Me2NH
4. (4) Me2NH > Me3N > MeNH2 > NH3

Correct answer: (1) Me2NH > MeNH2 > Me3N > NH3

Solution

The correct order reflects the increasing steric hindrance and decreasing availability of the lone pair on nitrogen for protonation in the methyl-substituted amines. Dimethylamine (Me2NH) has less steric hindrance compared to trimethylamine (Me3N), allowing it to better accept protons, while methylamine (MeNH2) is less basic than dimethylamine due to its single methyl group.

Related JEE Main Chemistry questions

• In Kjeldahl’s method, the nitrogen present in the sample is determined in the form of:
• What product is formed when benzenediazonium chloride (C6H5N2+Cl−) is treated with CuCl?
• When o-methoxybromobenzene is first reacted with sodamide and then treated with ammonia, which compound is obtained as the final product?
• An organic compound A, when treated with NH3, forms B. On heating, B gives C, and C on treatment with Br2 in the presence of KOH yields ethylamine. The compound A is:
• An organic nitrogen-containing compound gives an oily nitrosoamine when treated with aqueous nitrous acid at low temperature. Which compound is it?
• Which of the following statements are true? (i) In the Sandmeyer reaction, groups such as Cl, Br and CN are introduced into a benzene ring in the presence of Cu+ ions. (ii) In the Gattermann reaction, substitution into the benzene ring occurs in the presence of copper powder and HCl. (iii) The yield obtained in the Gattermann reaction is better than that in the Sandmeyer reaction.

⚔️ Practice JEE Main Chemistry free + battle 1v1 →