In the hydrogenation of $1_{\text{decyne}}$ to $\text{decane}$, how many equivalents of ${H2}_{\text{gas}}$ are required for complete reduction?

Show how you would accomplish the following synthetic transformations. Show all intermediates.

f. cyclodecyne → cis-cyclodecene

Show how you would accomplish the following synthetic transformations. Show all intermediates.

i. hex-1-yne → hexanal, CH₃(CH₂)₄CHO

Show how you would accomplish the following synthetic transformations. Show all intermediates.

g. cyclodecyne → trans-cyclodecene

What reagents should be used to carry out the following syntheses?

Which compound is formed when cyclohexene is reacted with $H_2$ in the presence of Pt catalyst?

Predict the product of the multistep synthesis