People Window | Spring Lecture Sc × \\ D Normal or Abnor x D PS3531N_Abnorr × Pe

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People Window | Spring Lecture Sc × D Normal or Abnor x D PS3531N_Abnorr × Pe ouse.com/mod/quiz/attempt.php?attempt-253080&scrollpos; 4200 q6 Help pt-2530808scroli Upgrade to High Sierra The structure for benzene can be represented as: of These two structures indicate that'? Select one a, there are two possible structures for benzene. b. the double bonds alternate between adjacent carbons. X c. the structure of benzene is unknown. O O d. no single Lewis structure adequately represents the structure of benzene Check INCORRECT Incorrect Marks for this submission: 0.00/1.00. This submission attracted a penalty of 0.50. Total penalties so far: 1.00. msds ppt (1).ppt | F6 F5 8

Explanation / Answer

d. no ssingle Lewis structure adequately represents the structure of benzene.

There are many organic molecules whose behaviour cannot be explained by single Lewis structure. Benzene contains C-C and C=C bonds are inadequate for explaining its characteristic properties.

Benzene should exhibit two different bond lengths, due C-C bond and C=C bond. However, as determined experimentally, benzene has a uniform C-C bond distance 1.39 pm a value intermediate between the C-C bond 1.54 pm and C=C bond 1.34 pm distances. Thus, the structure of benzene cannot be represented adequately by single structure.

Further, benzene can be represented equally by energetically identical structures as given. Therefore, according to resonance theory the actual structure of benzene cannot be adequately represented by any of the given structures, rather it is a hybrid of the given two structures.

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