Among NH3, CH3NH2, (CH3)2NH and (CH3)3N, which is the strongest base in the gas phase?

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Among $NH X_{3}$ , $CH X_{3} NH X_{2}$ , $(CH X_{3}) X_{2} NH$ and $(CH X_{3}) X_{3} N$ , which is the strongest base in the gas phase?

A $(CH X_{3}) X_{3} N$
B $NH X_{3}$
C $CH X_{3} NH X_{2}$
D $(CH X_{3}) X_{2} NH$

Answer: A

In the gas phase there is no solvation. Only the electron-releasing (+I) and polarisability effect of alkyl groups acts, stabilising the ammonium cation more with each added methyl. So the order is

(CH X_{3}) X_{3} N > (CH X_{3}) X_{2} NH > CH X_{3} NH X_{2} > NH X_{3}

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Among NHX3​, CHX3​NHX2​, (CHX3​)X2​NH and (CHX3​)X3​N, which is the strongest base in the gas phase?

Answer: A

More questions on Ortho effect and solvent effects

Among $NH X_{3}$ , $CH X_{3} NH X_{2}$ , $(CH X_{3}) X_{2} NH$ and $(CH X_{3}) X_{3} N$ , which is the strongest base in the gas phase?