Question

(a) (b) .CI For each compound below 1. Draw representations for the cis and trans isomers using a hexagon for the six- (i) membered ring, and wedges and dashes for substituents. Draw the two possible chair conformations for the cis isomer. Which conformation, if (ii) either, is more stable? Draw the two possible chair conformations for the trans isomer. Which conformation. (iii) if either, is more stable? Which isomer, cis or trans, is more stable and why? (iv) (w)

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Answer 1

3) cis trans (both are san (bo th aru sam) Trans ( both are sa (bo th are same) (1) a) Cis) both alkyl queups ari at oquiot'orial gosition, no 13 diaxial inturaction butween allkyl guaups hemu moru stabe rboth alky guaps are at ania ponition) Fusu is l13 diaial Interach hence des stabe CM3 (a) (b) bigger group alway be in eguiotovial porition (bcaun ad guiotorial perition turu biga guby O brany equistorial lde henu mero yable No dianlal interaction heno mou b

bi the Confermetion aw equally stablu bleaux both Con femation has om methyl at aNial and on methyl at equictorial II Comfermer (I) Is more stable becauy bothe Subshitunts occupy eguiotorial positior humu no dianial intoraction betwren them Whib conformer (I) is less stalle becau both the subshtutints are ot aal penition humu 13 diaxial mturo chon betwen the sustituuntr and hycoayen maker the Confermu ) ley stable ancas molecue Confermation in Wwch both alky groups are tan au m at oguisteval sid ao mou stabl becaux luse 13 dianial ntraction In Cs omfermer in may stalde trams Cles tal)

In moedle b) trans Confermation is mero stable becauy at trans Con lermation both substitutents occopy durachon between them and hydrogen whilu m Lon cis Conformation there is dija alal mteractiom the equiotorial sidu has no l13 diaxla between substitutents and hydryns 1,3 diaxal interaction -4 more stable less stable (thang) (w)