Which is the least stable chair conformer of the following compound?

Name: Which is the least stable chair conformer of the following compound?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The least stable chair conformer will have the largest number of axial groups, as axial groups experience more steric hindrance than equatorial groups. In option D, there are three bulky axial groups, while the other options have only two or one bulky axial groups. Therefore, option D is the least stable chair conformer.

Which Is the Least Stable Chair Conformer of the Following