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  4. The correct order of basicity is

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Q. The correct order of basicity is

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

$CH_{3}\overset{\cdot \cdot }{N}H_{2} \, $ (Aliphatic amines) Most basic due to +I effect of methyl group. Methoxy group provides electron density (+M)- $NH_{2}$

Solution

$-NO_{2}$ group with draws electron density from N of $-NH_{2}$

Solution



$CH_{3}\overset{\cdot \cdot }{N}H_{2} \, $ Most basic because $NH_2$ connected with $sp^3 C$ while in i, ii & iii Connected with

$sp^2 C$ & basic strength $ \propto $ +M/+I

basic strength $ \propto $ $\frac{1}{- \text{M}} \propto \frac{1}{- \text{I}}$

$NO_2$ exert $-M$ so least basic while -OCH3 exert +M so more basic

Solution

M effect is a stronger effect than the effect