Which of the following statements about the basicity of amines are correct? (Use the standard aqueous orders for methyl and ethyl amines.)

AIn water, $(CH X_{3}) X_{2} NH$ is a stronger base than $CH X_{3} NH X_{2}$ .
BIn water, $(C X_{2} H X_{5}) X_{3} N$ is a stronger base than $C X_{2} H X_{5} NH X_{2}$ .
CIn the gas phase, $(CH X_{3}) X_{3} N$ is a stronger base than $(CH X_{3}) X_{2} NH$ .
DIn water, $C X_{6} H X_{5} NH X_{2}$ is a stronger base than $NH X_{3}$ .

Answer: A, B, C

Aqueous order for methylamines:

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

, so (A) is true. For ethylamines the order is

(C X_{2} H X_{5}) X_{2} NH > (C X_{2} H X_{5}) X_{3} N > C X_{2} H X_{5} NH X_{2} > NH X_{3}

, so (B) is true. In the gas phase basicity rises with the number of alkyl groups, so (C) is true. Aniline is weaker than ammonia, so (D) is false.