Arrange the following compounds in order of increasing basicity (least to most)in aqueous solution:

Question

Quizplus · Accepted Answer

The basicity of a compound is determined by its ability to accept a proton. For compounds with the same type of functional group, basicity increases as the electron density on the functional group increases.

I: Ethylamine (CH3CH2NH2) - The amino group (-NH2) donates a pair of electrons to the nitrogen, making it more basic. 
II: Aniline (C6H5NH2) - The amino group is attached to an aromatic ring, which decreases electron density on the nitrogen, making it less basic than ethylamine. 
III: Dimethylamine (CH3)2NH - Both methyl groups donate electron density to the nitrogen, making it more basic than ethylamine. 
IV: Ethanolamine (HOCH2CH2NH2) - The amino group is attached to a hydroxyl group, which decreases electron density on the nitrogen, making it the least basic compound.

Therefore, the increasing order of basicity is: IV < II < I < III. Choice C correctly matches this order.

Arrange the Following Compounds in Order of Increasing Basicity (Least