1.
In the following reaction:

XH3C        CH3\underset{\text{H}_3\text{C}\;\;\;\;\text{CH}_3}{\text{X}} 1.  NaBH4    2.  D3O+\xrightarrow{1.\;\text{NaBH}_4\;\; 2.\;\text{D}_3\text{O}^+}

X and Y are: