The correct order of basicity of the following compounds is:

Among given the order of Basicity is

Based on I effect & electron density.Basicity depends on the negative charge on the nitrogen atom or electron density. With an increase in the -ve charge on the nitrogen atom, the basicity of the amines increases. Basicity depends on charge density. Basicity decreases with a decrease in charge density.Resonance and inductive effects decrease the basicity of an amine. Except in the case of guanidine, where nitrogen gains negative charge. Plus I effect will increase the basicity.