br br br br #viralbr #chemistry#students #notes#. br Cyclohexane, a six-membered ring, can exist in various conformations due to rotation around its carbon-carbon single bonds. The main conformations are:br br 1. Chair conformation:br - Most stable, with minimal steric hindrancebr - All bond angles are approximately 109.5° (tetrahedral)br - Hydrogen atoms are either axial (perpendicular to the ring) or equatorial (in the plane of the ring)br 2. Boat conformation:br - Less stable than chair, with some steric hindrancebr - Bond angles are distorted from tetrahedralbr - Hydrogen atoms are either axial or equatorialbr 3. Twist boat conformation:br - Intermediate stability between chair and boatbr - Bond angles are slightly distorted from tetrahedralbr - Hydrogen atoms are either axial or equatorialbr 4. Half-chair conformation:br - Unstable, with significant steric hindrancebr - Bond angles are significantly distorted from tetrahedralbr 5.