Amines

Which is stronger acid in the following pair?
$$2$$-Nitrophenol and $$2, 4, 6$$-Trinitrophenol.
The correct order of boiling points of the following amines $${ C }_{ 4 }{ H }_{ 9 }{ NH }_{ 2 },\left( { C }_{ 2 }{ H }_{ 5 } \right) _{ 2 }NH,{ C }_{ 2 }{ H }_{ 5 }N\left( { CH }_{ 3 } \right) _{ 2 }$$ is :
Chlorobenze gives aniline with
In the reaction shown, the major product(s) formed is/are:
Isopropylamine $$\xrightarrow{KMnO_4} X \xrightarrow{H_3O^+}Y$$.
In the above sequence $$X$$ and $$Y$$ are respectively