Question

The order of basicity of amines in gaseous state is:

• A. $1^{°}>2^{°}>3^{°}>N{H}_3$
• B. $3^{°}>2^{°}>N{H}_3>1^{°}$
• C. $3^{°}>2^{°}>1^{°}>N{H}_3$
• D. $N{H}_3>1^{°}>2^{°}>3^{°}$

Answer 1

Answer: (C)

The correct order of relative basicity of amines in the gas phase is $3^{°}>2^{°}>1^{°}>N{H}_3$ The alkyl group releases electron and thus, tends to disperse the positive charge of the alkyl ammonium ion and therefore stabilises it Since, $N{H}_4^{+}$ (from $N{H}_3$) has no such alkyl group, it is not stabilised to such an extent as alkyl ammonium ion.