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QJEEM19Chb340: JEE Main 2019 Chemistry - Class 12 JEEM19Chb340 Solution: Arrange the following amines in the decreasing order of…
Arrange the following amines in the decreasing order of basicity :
Multiple Choice Options
- A I > II > III
- B III > I > II
- C III > II > I
- D I > III > II
Step-by-Step Verified Solution
Baric nature depends on the tendency of donating the lone pair.
In (I) st amine lone pair of N atom is not in resonance. So it can easily donate the lone pair.
In (II) amine lone pair of N atom is in resonance. So, lone pair is not available.
In (III) amine lone pair of N atom is not in resonance so lone pair can be easily donated.
So, (I) and (III) are more baric compare to (II).
In (I) amine N atom is connected to sp2 hybridised carbon atom and in (III) amine N atom is connected to sp3 hybridised carbon atom.
We know sp2 carbon atom has more I effect than sp3 carbon atom.
So, in (I) amine density of electrons around N atom will decrease due to I effect and basic nature also decrease.
So, correct order of basic nature : III > I > II