1.

Adolfvon Beeyersuggestedthat,sincecarbonprefers tohavetetradralgeometrv wih bondanglesof approximately109^(@)ring sizesotherthanfiveand six may betoostrainedto exist ,Baeyer based hishypothesison thesimplegeometricalnationthata three-memberedring ( cyclopropane ) shouldbe anequilatera trianglewithbond anglesto 60^(@) a fourmembered ring (cyclobutane) shouldbe asquarewithbondanglesof 90^(@) and so on . Accordingto Beayer'sanalysiscyclopropane, witha bondablecompressionof 109^(@)-60^(@)=49^(@) , shouldhavea large amountof anglestrainand mustthereforebehighlyreactive cyclohexane becomes puckeredtoreeveitsstrainthe angulardeviation ofcycloalkaneis (-11^(@)) , Greater is the angulardeviationmore is thetorsinalstrain . whichof thefollowingcycloalkanehaszero strainenergy ?

Answer»

cyclobutane
cyclopentane
cyclohexane
cyclopropane

Answer :C


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