Question

a. The carbanion :C(CN)3- has a trigonal planar geometry (D_3hinstead of C_3v) in spite of the fact that there are four electron pairs about the central carbon.  Draw a resonance structure (any one of three equivalent structures) that explains the stereochemical inactivity of the lone pair.

b. Give the geometry, molecular shape about the central atom and hybridization for each central atom of:

1. H2C=C=CH2 2. IF2- 3. PCl4- 4. HONO2

Answer 1

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