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KCET2015ChemistryChemical Bonding and Molecular Structure

One of the following conversion results in the change of hybridization and geometry :

Options

  1. A( CH ₄ ) to ( C ₂ H ₆ )
  2. B( N H₃ ) to ( N H )
  3. C( B F₃ ) to ( B F₄ )
  4. D( H ₂ O ) to ( H ₃ O )

Correct answer

C. ( B F₃ ) to ( B F₄ )

Step-by-step solution

For the conversion, ( CH ₄ C ₂ H ₆ ), There is no change in the hybridisation of the carbon atom. Each carbon loses an atom of hydrogen and the two carbon hydrogen bonds are replaced by a carbon-carbon bond. Both ( CH ₄ ) and ( C ₂ H ₆ ) have ( sp ³ ) hybridisation and tetrahedral shape. For the conversion, ( NH ₃ NH ₄⁺ ) Nitrogen in ( NH ₃ ) has 3 bonds and one lone pair. It has ( sp ³ ) hybridisation, thus has a tetrahedral geometry but due to lone pair of electrons, its shape is pyramidal. On conversion to ( NH

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