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 number of π-bonds in each thionic/sulfur oxyacid species by drawing their Lewis structures to satisfy octets/valencies (S exhibits variable valency up to 6). Step 2: Calculate the π-bonds: (II) H2S2O3 has 2 π-bonds; (III) H2S2O5 has 3 π-bonds; (I) H2S2O6 has 4 π-bonds. Step 3: Order the compounds by increasing number of π-bonds: II (2) < III (3) < I (4), which corresponds to option (c).

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