Determine whether the cis isomer or the trans isomer of the following compound is more stable.

• A. The less bulky group (iso-propyl) is at the equatorial position and (tert-butyl) is at the axial position. Thus, the trans-conformation is more stable.
• B. The bulkier group (tert-butyl) is at the equatorial position and (iso-propyl) is also at the equatorial position. Thus, the cis-conformation is more stable.
• C. The bulkier group (tert-butyl) is at the equatorial position and (iso-propyl) is at the axial position. Thus, the cis-conformation is more stable.
• D. The bulkier group (tert-butyl) is at the axial position and (iso-propyl) is also at the axial position. Thus, the cis-conformation is more stable.

Answer: (B)