JEE Main20199 Jan 2019Morning ShiftChemistryGeneral Organic ChemistryActual
Arrange the following amines in the decreasing order of basicity.
Options
- AI I I > I > I I
- BI > I I I > I I
- CI I I > I I > I
- DI > I I > I I I
Correct answer
A. I I I > I > I I
Step-by-step solution
K b Values are a measure of basicity. Higher the K b value, greater will be basicity. (I) Basic character α 1 %  s- character N - sp 2 has more % s-character than N - sp 3 so it is less basic as compare to N - sp 3 Hence I I I > I . (II) In the (ii) structure lone pair present on the N atom is involved in aromaticity so, it is difficult to donate. Hence, least basic Thus, the correct order will be: I I I > I > I I