The correct order of the basic strength of methyl substituted amines in aqueous solution is

Options

A. `CH_(3)NH_(2)gt(CH_(2))_(2)NHgt(CH_(3))_(3)N`
B. `(CH_(3))_(2)NHgtCH_(3)NH_(2)gt(CH_(3))_(3)N`
C. `(CH_(3))_(3)NgtCH_(3)NH_(2)gt(CH_(3))_(2)NH`
D. `(CH_(3))_(3)Ngt(CH_(3))_(2)NHgtCH_(3)NH_(2)`

Answer

B

Explanation

`K_(b)` of methyl substituted amines in auous solution depend upon combined effect of `+l` of methyl and solubility in `H_(2)O` by H-bonding and order is
`K_(b)(CH_(3))_(2)NHgtCH_(3)-NH_(2)gt(CH_(3))_(3)N`