<Li> a torsion angle between 0 ° to 30 ° is called synperiplanar or syn - or cis - conformation (sp) </Li> <Li> a torsion angle between 30 ° to 90 ° and--30 ° to--90 ° is called synclinal or gauche or skew (sc) </Li> <Li> a torsion angle between 90 ° to 150 °, and--90 ° to--150 ° is called anticlinal (ac) </Li> <Li> a torsion angle between ± 150 ° to 180 ° is called antiperiplanar or anti or trans (ap). </Li>

Describe a steriochemical formula in terms of the vsepr theory