Identify the product formed when the mixture of Phenol and Hydrogen...

When a mixture of phenol and hydrogen is passed over a finely divided nickel catalyst at $433\text{ K}$, catalytic hydrogenation of the aromatic ring takes place.

The three double bonds of the benzene ring are reduced by the addition of three moles of hydrogen gas, converting the aromatic ring into an aliphatic cyclohexane ring. The hydroxyl ($-OH$) group remains unaffected during this process.

$\text{C}_6\text{H}_5\text{OH} + 3\text{H}_2 \xrightarrow{\text{Ni, } 433\text{ K}} \text{C}_6\text{H}_{11}\text{OH}$

The product formed is cyclohexanol, which corresponds to the structure in the second option.

Answer: