Question

The correct increasing order of basic strength for the following compound is:

• A. II < III < I
• B. III < I < II
• C. III < II < I
• D. II < I < III

Answer 1

The correct option is D II < I < III

The correct increasing order of basic strength is

(II) $-N{O}_2$ is a strong EWG group which decreases the electron density on N by $-R$ effect. Thus making lone pair less available for donation.
(III) $-C{H}_3$ is a strong EDG group which increases the electron density on C by $+I$ effect. Thus making lone pair more available for donation.
(I) basicity will be in between (II) and (III).