The the most stable conformer of cis-cyclohexan-1,4-diol is:

Options

A. (a) Diaxial boat from
B. (b) Diequatiorial boat from
C. (c) Diaxial chair from
D. (d) Diequatiorial chair from

Answer

To determine the most stable conformer of cis-cyclohexan-1,4-diol, we need to analyze the different conformations available for this compound. Here’s a step-by-step solution:

### Step 1: Understand the Structure of cis-Cyclohexan-1,4-diol
Cis-cyclohexan-1,4-diol has two hydroxyl (OH) groups located on the 1 and 4 positions of the cyclohexane ring. The "cis" designation means that both OH groups are on the same side of the ring.

### Step 2: Identify Possible Conformers
The possible conformers for cyclohexan-1,4-diol include:
- Di-axial (both OH groups in axial positions)
- Diequatorial (both OH groups in equatorial positions)
- Di-axial chair (one OH group axial, one equatorial)
- Equatorial chair (one OH group equatorial, one axial)

### Step 3: Analyze the Di-axial Conformer
In the di-axial conformer, both OH groups are positioned axially. This arrangement allows for intramolecular hydrogen bonding between the two hydroxyl groups, which stabilizes the structure. However, axial positions can lead to steric strain due to 1,3-diaxial interactions.

### Step 4: Analyze the Diequatorial Conformer
In the diequatorial conformer, both OH groups are positioned equatorially. While this arrangement avoids steric strain, it does not allow for any intramolecular hydrogen bonding, which would contribute to stability.

### Step 5: Analyze the Di-axial Chair Conformer
In this conformer, one OH group is axial and the other is equatorial. This arrangement also does not allow for intramolecular hydrogen bonding and may introduce some steric strain due to the axial position of one OH group.

### Step 6: Analyze the Equatorial Chair Conformer
In the equatorial chair conformer, one OH group is equatorial and the other is axial. Similar to the di-axial chair, this conformer does not allow for intramolecular hydrogen bonding.

### Step 7: Determine the Most Stable Conformer
The most stable conformer of cis-cyclohexan-1,4-diol is the di-axial conformer due to the presence of intramolecular hydrogen bonding, which significantly stabilizes the structure despite the steric strain.

### Conclusion
The most stable conformer of cis-cyclohexan-1,4-diol is the **di-axial conformer**.

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