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Structural data evolves with time, even for simple molecules. Consider the compounds E(CF3)3, i.e, the tris(trifluoromethyl) derivatives...

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Chemistry

Structural data evolves with time, even for simple molecules.Consider the compounds E(CF3)3, i.e, thetris(trifluoromethyl) derivatives of P, As, and Sb. C-E-C bondangles were determined by gas-phase electron diffraction in themid-20th century and given as: E=P, 99.6°; E=As, 100.1°;E=Sb,100.0°.          

a) Does this trend seem reasonable, and explain youranswer.                    

b) A more rigorous recent similar experiment gave a C-As-C bondangle of 95.4°, compared to a calculated value of 95.9°. In view ofthis which of the other two C-E-C bond angles seems most suspect,and why?

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