JEE Main2013ChemistryAminesActual
The order of basicity of amines in gaseous state is :
Options
- A1^ >2^ >3^ > NH ₃
- B3^ >2^ > NH ₃>1^
- C3^ >2^ >1^ > NH ₃
- DNH ₃>1^ >2^ >3^
Correct answer
C. 3^ >2^ >1^ > NH ₃
Step-by-step solution
The correct order of relative basicity of amines in the gas phase is 3^ >2^ >1^ > NH ₃ The alkyl group releases electron and thus, tends to disperse the positive charge of the alkyl ammonium ion and therefore stabilises it. Since, NH ₄ ⁺ (from NH ₃ ) has no such alkyl group, it is not stabilised to such an extent as alkylammonium ion.