What is the order of basic strength in CH3NH2 , (CH3) 2NH and N(CH3) 3?

Answer 1

Remember that steric hindrance can affect basicity. The basic nitrogen has a lone pair of electrons that it will use to attack acids. In CH3NH2, the nitrogen is relatively unhindered as it only has one alkyl group. Apply this to the other two molecules to get the trend. Hope this helps!