In the above sequence of reactions, the major products $\mathrm{X}$ and $\mathrm{Y}$ are __________

In the following transformation

reagents $1$ and $2$ are __________

Two isomeric compounds $\mathrm{I}$ and $\mathrm{II}$ are heated with $\mathrm{HBr}$.

The products obtained are

For the transformation

the reagent used is:

The reaction

is known as:

The products $\mathrm{X}$ and $\mathrm{Y}$ in the following reaction sequence are :