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Van der Waals repulsions
Because severe van der Waals repulsions occur among the tert-butyl groups in compound A at normal bond lengths and angles, the only way for the molecule to relieve these repulsions is to stretch the appropriate bonds and flatten itself by widening the C-C-C angles. The observed structure is a compromise among the Scylla of van der Waals repulsions and the Charybdis of nonoptimal bond lengths and angles.
The ratio of the energy of a photon of 2000Å wavelength radiation to that of 4000 Å radiation is: (1) 1/4 (2) 4 (3) 1/2 (4) 2 Ans
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