What is obtained upon the reduction of $t$-butyl isocyanide?

Arrange the following bases in decreasing order of basicity:
$(i)$ Aniline
$(ii)$ $o$-nitroaniline
$(iii)$ $m$-nitroaniline
$(iv)$ $p$-nitroaniline

The major product in the following reaction is:

The product of the reaction is:

Identify the tertiary amine from the following.

Considering the above reaction,$X$ and $Y$ respectively are