Question

The correct order of basic strength of
$CH _{3} NH _{2}$ (I),
$\left( CH _{3}\right)_{2} NH$ (II),
$\left( CH _{3}\right)_{3} N$ (III),
$C _{6} H _{5} CH _{2} NH _{2}$ (IV) in gaseous phase is

• A. IV < III < II < I
• B. IV < III < I < II
• C. I < II < III < IV
• D. IV < I < II < III

Answer 1

Answer: (D)

In gaseous phase, the basic strength of alkylamines follows the following order
$3^{\circ}>2^{\circ}>1^{\circ}$
This is because of the presence of electron releasing $- CH _{3}$ group which increases the electron density over nitrogen and thus, makes the more availability of lone pair for donation. Hence, the correct order of basic strength is