Chemistry Chemical Bonding ETEA 2019
PMDC Verified Question 78 of 102
A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be:
A
Tetrahedral
B
Trigonal pyramidal
C
Angular
D
Linear
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Angular
Concept:

A molecule with 4 total electron domains (2 bond pairs, 2 lone pairs) is based on a tetrahedral electron geometry.

Formula:

$$ \text{Type} = \text{AB}_2\text{E}_2 \implies \text{Bent / Angular} $$

Solution:

  • The central atom is \( \text{sp}^3 \) hybridized.


  • The two bulky lone pairs strongly repel each other and the bond pairs, squeezing the bond angle (e.g., in water \( \text{H}_2\text{O} \), from 109.5° down to 104.5°).


  • Because molecular shape is determined only by the positions of the atoms, the resulting shape is angular (bent).


Why other options are incorrect:

  • Option A: Requires 4 bond pairs and 0 lone pairs.
  • Option B: Requires 3 bond pairs and 1 lone pair.
  • Option D: Requires no lone pairs interfering with the bonds.

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