The increasing basicity order of the following compounds is:

Step-by-step solution

In case of polar protic solvents, two factors decide the basic character. The positive inductive effect from alkyl groups which increases basicity. 3 o > 2 o > 1 o Amine & the Steric Hindrance. 1 o > 2   > 3 o  Thus, the resultant basic character is determined by taking the above two factors into account. So order will be 2 o > 1 o > 3 o if methyl group is present as alkyl group otherwise order will be 2 ° > 3 ° > 1 ° . In aromatic & Aliphatic: Aliphatic Amin