In XeF4 the two lone pairs of electrons can be placed in opposite or adjacent positions. Placement of two lone pairs adjacent opposite number of each type of 90 degree repulsive interactions 90o LP-LP _______ 90o LP-BP ______ 90o BP-BP ______ 90o LP-LP ______ 90o LP-BP ______ 90o BP-BP ______ In terms of increasing repulsions between electron pairs, the trend is: BP-BP (least repulsive) > BP-LP > LP-LP (most repulsive) In order to minimize repulsions between electron pairs situated 90° apart, the two lone pairs of electrons should be placed in _________________ positions.

Q: a. Predict the molecular structure and bond angles for SeCl6. Approximate bond angles are…

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Q: Are these products correct?

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Q: Which is an AB3 molecule that has μ ‡0? O PC13F2 O SeCl₂ O NBr3 O SeO₂ O Bl3

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Q: . Identify the a. shortest C-H bond b. longest C-H bond   2. Predict the C-C bond that has the…

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Q: How many sigma and pi bonds, respectively, are in the molecule below? CH3CH2CHCHCH3

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Q: Which compound is nonaromatic? Assume all molecules are flat/planar. b. Of. Å N=N NH

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Q: 1. How many isomers hexane has? 04 Os 03

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Stereochemistry and Isomerism

Stereochemistry deals with the three-dimensional structure and properties of molecules. It explains the arrangement of atoms and their manipulation within a molecule in a 3D structure. Stereochemistry can be dealt with all types of molecules. Based on the stereochemistry of a molecule, the physical and chemical properties of the molecules vary.