How many alkenes which on hydrogenation give $2$-methylbutane.

In the above reaction the using reagents $\mathrm{X}$ and $\mathrm{Y}$ are:

An alkene $\text{'}\mathrm{A}\text{'}$ contains three $\mathrm{C}-\mathrm{C}$, eight $\mathrm{C}-\mathrm{H\sigma }$ bonds and one $\mathrm{C}-\mathrm{C\pi }$ bond. $\text{'}\mathrm{A}\text{'}$ on ozonolysis gives two moles of an aldehyde of molar mass $44\mathrm{u}$. IUPAC name of compound $\text{'}\mathrm{A}\text{'}$ is:

An organic compound on reaction with ${\mathrm{O}}_3$ followed by $\mathrm{Zn}$ and ${\mathrm{H}}_2\mathrm{O}$ gives ${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{CH}}_2{\mathrm{COCH}}_3$ as one of the product. The structures is/are: