Which one of the following molecules shows a linear geometry?
Correct answer: C. HCN
- A. H2O
- B. Cl2O
- C. HCN
- D. C2H4
Explanation
The geometry of HCN (hydrogen cyanide) is linear. In HCN, the central carbon atom is bonded to a hydrogen atom and a nitrogen atom. The linear molecular geometry arises from the arrangement of the atoms, with the hydrogen and nitrogen atoms on opposite sides of the carbon atom, forming a straight line. This linear geometry results from the arrangement of the bonding and lone pairs of electrons around the carbon atom, leading to a linear shape with a bond angle of approximately 180 degrees.
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