what is the correct order of basicity It asks about the basicity. All have the same hybridization so through inductive effect, 3 should be the most acidic. I feel that my assumption is wrong. Can anyone help? The answer is 3>4>1>2.
$\ce{-CH3}$ group has +I effect; it has electron donating effect. It increases basicity and reduces acidity.
Moreover due to resonance in phenyl group, the availability of electrons over N decreases.