Question

The correct order of basicity is

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

$C{H}_3\stackrel{\cdot \cdot }{N}{H}_2$ (Aliphatic amines) Most basic due to +I effect of methyl group. Methoxy group provides electron density (+M)- $N{H}_2$



$-N{O}_2$ group with draws electron density from N of $-N{H}_2$





$C{H}_3\stackrel{\cdot \cdot }{N}{H}_2$ Most basic because $N{H}_2$ connected with $s{p}^{3}C$ while in i, ii & iii Connected with

$s{p}^{2}C$ & basic strength $\propto$ +M/+I

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

$N{O}_2$ exert $-M$ so least basic while -OCH₃ exert +M so more basic



M effect is a stronger effect than the effect