11th Class Chemistry Chemical Bonding and Molecular Structure

  • question_answer 77)   Explain the shape of \[Br{{F}_{5}}\]


      Shape of \[\mathbf{Br}{{\mathbf{F}}_{\mathbf{5}}}\] Br-atom has configuration : \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{2}}4{{p}^{5}}\] To get pentavalency, two of the p-orbitals are unpaired and electrons are shifted to 4d-orbitals. In this excited state \[s{{p}^{3}}{{d}^{2}}\]-hybridisation occurs giving octahedral structure. Five positions are occupied by F atoms forming sigma bonds with hybrid bonds and one position occupied by lone pair i.e., the molecule as a square pyramidal shape.

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