Final answer:
To convert cyclohexanol to cyclohexane, the most straightforward and efficient method is option A, which involves dehydration of cyclohexanol to form cyclohexene using H₂SO₄ and heat, followed by hydrogenation to form cyclohexane using H₂ and a Pd catalyst.
Step-by-step explanation:
The conversion of cyclohexanol to cyclohexane involves removing the hydroxyl group (-OH) and replacing it with hydrogen. This process is typically a two-step reaction where the first step involves converting the alcohol to a better leaving group, and the second step is the actual hydrogenation. Looking at the options provided:
- Option A: 1. H₂SO₄, heat; 2. H₂/Pd is a feasible method because sulfuric acid (H₂SO₄) can be used to dehydrate cyclohexanol, forming cyclohexene, and subsequent hydrogenation with hydrogen gas (H₂) and a palladium catalyst (Pd) would result in cyclohexane.
- Option B: 1. CH₃CH₂ONA is actually sodium ethoxide, which could be involved in a substitution reaction but it's not suitable for the dehydration needed here; 2. H₂/Pd would then hydrogenate the double bond similar to Option A.
- Option C: 1. TsCl/pyridine introduces a tosylate group as a good leaving group; 2. CH₃CH₂ONa is sodium ethoxide, which could displace the tosylate, but it is not necessary in this transformation; 3. H₂/Pd can then hydrogenate the intermediate.
When considering both the accuracy and necessity of the steps involved, Option A is the most straightforward and efficient route for converting cyclohexanol to cyclohexane.