Amongst the following the most basic compound is

An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives NH₃ along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is

The correct order of increasing basic nature for the bases NH₃, CH₃NH₂ and (CH₃)₂ NH is

Ethyl isocyanide on hydrolysis in acidic medium generates