[sharbeldam]

Compound X -> C9H15NO2 (molecular mass 169g/m) undergoes hydrolysis to produce Y (72g/mol) and Z (115gr/mol)

I'm given H-NMR and IR of X and IR of Y, in H-NMR OF X the number of hydrogens from right to left is (6->3->2->4)
Z has peaks in 1715/3290/3350 in IR.

if we look at H-NMR of X, there are 4 hydrogens in the range of 5-7, these arent aromatic but vinylic and maybe the last one of them is amide H? it's so hard to tell but this is my try, am i right?

[Orcio_87]

Right.... =C-H and -N-H are the most shifted H⁺ in NMR spectrum.

[Babcock_Hall]

In my experience amide and related NH hydrogens can vary considerably in chemical shift, partially owing to hydrogen bonding.  This can make assigning them a little tricky.