Question

A mixture of hept-1-yne, hept-2-yne, and hept-3-yne was hydrogenated in the presence of a platinum catalyst until hydrogen uptake ceased. If one assumes that the hydrogenation went to completion, how many different seven-carbon hydrocarbons were produced?

Answer 1

Only one seven carbon hydrocarbon was produced.

Step-by-step explanation:

• Alkynes are reduced completely in presence of
  `Pt/H_(2)` to produce alkanes.
• Hydrogenation in presence of Pt is a simple nucleophilic addition process where
  `H_(2)` molecule adds onto an unsaturated bond.
• Hept-1-yne, hept-2-yne and hept-3-yne are constitutionally isomeric to each other. Hence, after complete reduction, all three alkynes produced heptane as only product.
• So, only one seven carbon hydrocarbon was produced.