Question

with explanation

1) Draw a chair conformation of cyclohexane. Then, draw and level properly all axial and equatorial positions on chair form of cyclohexane. 2) Draw chair, half-chair and boat conformations of ethyl cyclohexane and draw an energy diagram to explain their relative stability: 3) Draw two possible chair conformations for each of the mono-substituted cyclohexanes and determine their relative stability with proper explanation. OH 4) Draw two possible chair conformations for each of the di-substituted cyclohexanes and determine their relative stability. 5) Draw the most stable chair conformation for each of the following compounds. 6) Identify the relationship (identical, enantiomers, diastereomers or constitutional isomers) for the following pair molecules. Provide proper reasoning for the correct identity a b) itte

Answer 1

HA.) fex) enp -M fea.) ar Mfen) (ea)H Har Car.) Czl C2H5 Boat Chair A Cas Half chair Sto Ena chair Boaty A1 Hot Fchoir Eplan ain Boat Confmahn s maale up tuoo chai'r ethane Condermatin t eclippeel mode 1'h two ondamntintethane Half chair plane, thus chair fm S C's in one Contains amgle Bhh Contains 3 c's Tes. wheaeas plase Cne Canyle rain

11 141 A or Ce 2 Butane 1,3-daxal interach, anel due to F C D A EB above relahve Shbli Pnteractn auehe the ts obereal H-1 HIS H 2- 3 1 tt 111 R Ant No Bume Butne Gravehe Cnauche

Ce A A e F Ca,e) (e. a,a One the two axial Posirn lkads to Buteme 1,3 anel oliaxtal intrahn Thus they nteractn ganehe one's than equtnrt 1ess stble Conformahn: Most Stble chair bulk at e.

Sulle gron at ea. CM3 Ce ce ce 1,3-clraxl flerachin eg firs POsitrm Note Conattnae Conshituhral 9 bamoy (Pobbton i is alift Diastereomerp (tomhy. at one Cabm oten C