On catalytic reduction `(H_(2)//Pt)` how many alkenes will give 2-methylbutane?

On catalytic reduction (H_(2)//Pt) how many alkenes will give n-butane?

On catalytic reduction with H_(2)//Pt how many alkenes will give n-butane?

Compound (X) on complete catalytic hydrogenation with H_2//Pt gives an alkane. The number of moles of H_2 required per mole of compound (X) is: