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Question

Among the following molecules, the molecule with linear shape is:


  1. Water

  2. BH3

  3. CH4

  4. CO2

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Solution

The correct option is D

CO2


Explanation for correct option:

D. CO2

Hybridization:

  • Hybridization is defined as the process of intermixing of the orbitals of slightly different energies so as to redistribute their energies, resulting in the formation of a new set of orbitals of equivalent energies and shape.”

Hybridization of carbon in carbon dioxide:

  • The hybridization state of carbon in CO2 is sp hybridized.
  • The two sp hybridized orbitals of the carbon atom overlap with two p orbitals of the oxygen atom to form two sigma σ bonds while the other two electrons of carbon are involved in π-π bonding with the oxygen atom.
  • Carbon dioxide has a linear geometry.

Explanation for incorrect options:

A. Water has a bent geometry. In hybridization of H2O, the oxygen atom is sp3 hybridized.

B. In BH3, Boron has three valence electrons, it will have sp2 hybridization. As per VSEPR theory, it has trigonal planar geometry.

C. In CH4, the hybridization sp3 and has tetrahedral geometry as per VSEPR theory.

Hence, the correct option is D i.e. CO2.


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