The molecule in which an atom is associated with more than 8 electrons is known as hypervalent molecule and less than 8 electrons is known as hypovalent molecule. All hypervalent molecules must have p

Question

The molecule in which an atom is associated with more than 8 electrons is known 
as hypervalent molecule and less than 8 electrons is known as hypovalent 
molecule. All hypervalent molecules must have p$\pi$-d$\pi$ bonding but the 
molecules having back bonding need not to have always p$\pi$-d$\pi$ bonding.

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Determine the geometry of ethyne (C2H2): each carbon is sp hybridized, yielding a symmetric linear structure (H-C≡C-H). Step 2: Analyze the structures of the options: H2O2 is open-book (non-planar), NO2 is bent (sp2 with an odd electron), SnCl2 is bent (sp2 with one lone pair). Step 3: Carbon dioxide (CO2) is sp hybridized and linear (O=C=O). Therefore, C2H2 is isostructural with CO2, matching option (d).

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