Question:
Identify the product formed when the mixture of Phenol and Hydrogen is passed over nickel catalyst at 433 K.
Identify the product formed when the mixture of Phenol and Hydrogen is passed over nickel catalyst at 433 K.
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Hydrogen over nickel hydrogenates the benzene ring of phenol without removing the OH group.
Updated On: Nov 12, 2026
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Catalytic hydrogenation over Ni at about 433 K adds hydrogen across the double bonds of the aromatic ring.
Step 2: Reaction
\(\text{C}_6\text{H}_5\text{OH}+3\text{H}_2\xrightarrow{\text{Ni},\ 433\ \text{K}}\text{C}_6\text{H}_{11}\text{OH}\)
All three ring double bonds take up hydrogen and the O\(-\)H group stays.
Step 3: Product
The saturated six-membered ring with an OH group is cyclohexanol.
Final Answer:
The product is cyclohexanol. \[ \boxed{\text{(B) }\text{the structure of cyclohexanol}} \]
Catalytic hydrogenation over Ni at about 433 K adds hydrogen across the double bonds of the aromatic ring.
Step 2: Reaction
\(\text{C}_6\text{H}_5\text{OH}+3\text{H}_2\xrightarrow{\text{Ni},\ 433\ \text{K}}\text{C}_6\text{H}_{11}\text{OH}\)
All three ring double bonds take up hydrogen and the O\(-\)H group stays.
Step 3: Product
The saturated six-membered ring with an OH group is cyclohexanol.
Final Answer:
The product is cyclohexanol. \[ \boxed{\text{(B) }\text{the structure of cyclohexanol}} \]
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