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

• A. Cyclohexanone
• B. Benzene
• C. Cyclohexane
• D. 1,2-dihydrocyclohexene

Answer: (C)

Verified step by step guidance

1. Identify the type of reaction: The reaction of cyclohexene with hydrogen gas (\( H_2 \)) in the presence of a platinum (Pt) catalyst is a catalytic hydrogenation reaction.
2. Understand the role of the catalyst: The Pt catalyst facilitates the addition of hydrogen atoms across the double bond of cyclohexene without affecting other parts of the molecule.
3. Determine the site of reaction: Cyclohexene contains a carbon-carbon double bond (alkene). Hydrogenation will add one hydrogen atom to each carbon of this double bond, converting it into a single bond.
4. Write the general hydrogenation reaction: \( \text{Cyclohexene} + H_2 \xrightarrow{Pt} \text{Cyclohexane} \). This means the double bond is saturated, forming cyclohexane.
5. Confirm the product: Since the double bond is fully hydrogenated, the product is cyclohexane, a saturated cyclic hydrocarbon with no double bonds.