This goes back to the template shown at 10:58Â under the both together text. Think of this as your template of all the possible equatorial and axial positions. Then looking at the given cyclohexane you look at the attached substituents, you also number the chain and apply this to the chair.Â
There are multiple possibilities but remember the one with the most equatorial positions is the best and if there is a tie then pick the one that has the bulkier group in the equatorial position.Â
There's another example of this in the below video it's question 3 at timestamp 14:34.

Study With Us: Drawing Chai...
Replied on Lesson: Oxidation Reactions of Alcohols
28 Jan 23:00
1. Swern Oxidation
Reagents: Uses dimethyl sulfoxide (DMSO), oxalyl chloride, and a base like triethylamine.
Conditions: Mild and performed at low temperatures (around -78°C).
Products:
Primary alcohols → Aldehydes.
Secondary alcohols → Ketones.Selectivity: It’s selective and does not over-oxidize primary alcohols to carboxylic acids. It stops at the aldehyde stage.
2. PCC (Pyridinium Chlorochromate)
Reagents: PCC is a chromium-based oxidizing agent, often used with a solvent like dichloromethane (DCM).
Conditions: Mild and does not require extreme temperatures.
Products:
Primary alcohols → Aldehydes.
Secondary alcohols → Ketones.
Selectivity: PCC is also selective and stops at the aldehyde stage for primary alcohols. It does not oxidize further to carboxylic acids, unlike chromic acidÂ