Draw Lewis Structures for the first three amines and classify all the following amines as Secondary $(2),$ and Tertiary $(3)$ Amines. Errors often occur in $6\mathrm{.}2.$ N has $3-$Bonds & C$\text{'}$s have $4-$Bonds, $6\mathrm{.}1C{H}_{3}C{H}_{2}N(C{H}_3{)}_2$

$6\mathrm{.}2(C{H}_3{)}_{2}CN{H}_{2}C{H}_{2}C{H}_3$

$6\mathrm{.}3C{H}_{3}C{H}_{2}NHC{H}_3$

The rest are given in the picture.

$6\mathrm{.}4$

$6\mathrm{.}5$

$6\mathrm{.}6$